JWST User Documentation

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Proposing Opportunities

  • • Opportunities and Policies

  • Call for Proposals for Cycle 4
    • • New and Important Features
    • • Proposal Workflow
    • • Anonymous Proposal Reviews
    • • Proposal Submission Policies
    • • Proposal Categories
    • • Observation Types
    • • Data Rights and Duplications
    • • Proposal Selection Procedures
    • • Guidelines and Checklist for Proposal Preparation
    • • Filling Out the APT Proposal Form
    • • Preparation of the PDF Attachment
    • • Proposal Implementation and Execution
    • • Grant Funding and Budget Submissions
    • • Appendix - Science Keywords

  • • Cycle 3 Director's Discretionary (DD) Time Proposals

  • • Director's Discretionary Time

  • General Science Policies
    • • Guidelines for Proposals where JWST and HST Overlap in Capabilities
    • • Observing Overheads and Time Accounting Policy
    • • Duplicate Observations Policy
    • Observation Duplication Checking
      • • Identifying Potential JWST Duplicate Observations
    • • Science Parallel Observation Policies and Guidelines
    • • The Single-Stream Proposal Process
    • • Micrometeoroid Avoidance Zone Policies and Procedures
    • • Observing Program Modification Policy
    • • Policies for the Telescope Time Review Board
    • • How to Submit a Program Change Request (PCR)
    • • Target of Opportunity Program Activation
    • NASA-SMD Policies and Guidelines for the Operations of JWST at STScI
      • • Policy 1 - Limitations on the Use of Funds for the Research of General Observers and Archival Research
      • • Policy 2 - Data Rights and Data Dissemination
      • • Policy 3 - Data Requests and Facilities
      • • Policy 4 - Post-Launch Commissioning of JWST
      • • Policy 5 - Clarification of Extensions of Exclusive Access Data to Public Affairs Activities
      • • Policy 6 - Distribution of JWST Science Data Obtained from Investigations Other Than Those Selected Through the Peer-review Process
      • • Policy 7 - NASA Needs for Support for Other Missions
      • • Policy 8 - Definition of Observing Time
      • • Policy 9 - Allocation of Guaranteed Observing Time to Scientists Selected Under AO 01-OSS-05 and Through NASA-ESA-CSA Agreements
      • • Policy 10 - Redistribution of Guaranteed Observing Time Among Observers
      • • Policy 11 - Protection of Science Programs Associated With Guaranteed Time
      • • Policy 12 - Education and Public Outreach
    • • Submission Process for Joint JWST Proposals where the Partner Observatory is Prime
    • • Review and Implementation of Rapid Response Observations on JWST

  • JWST Peer Review Information
    • JWST Peer Review Guide
      • • Discussion Panelists
      • • Executive Committee (Chairs and Vice Chairs)
      • • External (No Discussion) Panelists
      • • Panel Support Scientists
    • General Info and Getting Started
      • • Code of Conduct
      • • Confidentiality
      • • Conflicts of Interest
      • • JWST and its Instruments
      • • Proposal Types, Sizes and Science Areas
      • • JWST Duplication Identification and Adjudication Procedures for the TAC
      • • Tips for a Smooth Review
      • • Who to Contact for Help
      • • Orientation Materials
    • Reviews, Grades and Comments
      • SPIRIT WebReviewer Tool Guide
        • • Viewing Panel Assignments and Resources
        • • Navigating and Viewing Panel Proposals
        • • Grading by Worksheet
        • • Entering A Proposal Grade
        • • Entering Proposal Feedback Comments
        • • Entering Private Notes
        • • Entering Shared Remarks
        • • Submitting the Final Version of the Proposal Feedback Comments
        • • Viewing Final Ranking
        • • Viewing SPIRIT Notifications
      • • Dual Anonymous Proposals Guide for Reviewers
      • • Selection Criteria and Scoring System
      • • Proposal Feedback Comments
    • Panel Meetings
      • • Guidelines for Discussion Panel Chairs
      • • Webex and Slack Guidelines
      • • Primary, Secondary Reviewers and Graders
      • • Triage Process and Discussion List
      • • Preparing for the Panel Meeting
      • • Discussion Panel Meetings
      • • Final Ranking
      • • Large, Treasury and Legacy Proposals
      • • Executive Committee
      • • Executive Committee Expert Reviews
    • STScI Staff
      • • Role of Panel Support Scientists
      • • Panel Advisors and Observers
      • • Science Policies Group (SPG) Members

  • Past Proposal Opportunities
    • • Director's Discretionary Early Release Science Call for Proposals
    • Cycle 1 Guaranteed Time Observations Call for Proposals
      • • Cycle 1 GTO Proposal Submission Policies
      • • Cycle 1 GTO Proposal Submission Process
      • • Cycle 2 and 3 GTO Proposal Process
      • GTO Observation Specifications
        • • Cycle 1 GTO Observations Available for Archival Proposals
        • • GTO MIRI Observations Table
        • • GTO NIRCam Observations Table
        • • GTO NIRISS Observations Table
        • • GTO NIRSpec FSS and IFU Observations Table
        • • GTO NIRSpec MOS Observations Table
    • Call for Proposals for Cycle 1
      • • Cycle 1 Proposal Deadline Extension Request
      • • Cycle 1 Anonymous Proposal Review
      • • Cycle 1 Proposal Policies and Funding Support
      • Cycle 1 Proposal Categories
        • General Observer (GO) Proposals
          • • Small, Medium, and Large GO Proposal Categories
          • • Joint -HST Observing Programs
          • • Survey GO Proposals
          • • Calibration GO Proposals
          • • Treasury Status GO Proposals
          • • Long-Term Status GO Proposals
        • Archival (AR) Proposals
          • • Regular and Legacy AR Proposals
          • • Theory Proposals
          • • Calibration AR Proposals
          • • Community Data Science Software Proposals
        • • Director's Discretionary (DD) Time Proposals
      • Cycle 1 Observation Types and Restrictions
        • • Coordinated and Pure-Parallel Observations
        • • Time Constrained Observations
        • • Solar System Observations
        • • Target of Opportunity Observations
        • • Observations of Targets That Have Not Yet Been Discovered or Identified
        • • Follow-up Observations of Pre-imaging
      • • Cycle 1 Proposal Preparation
      • • Cycle 1 Single-Stream Proposal Process
      • • Cycle 1 Special Submission Requirements
      • • Cycle 1 Observation Mode Restrictions
      • • Cycle 1 Proposal Selection Process
      • • Cycle 1 Awarded Program Implementation
      • • Cycle 1 Grant Funding and Budget Submissions
      • • Cycle 1 Proposal Science Categories and Keywords
    • Telescope Allocation Committee (TAC) Instructions - Cycle 1
      • • Proposal Review Getting Started Guide - Cycle 1
      • • Overview - Cycle 1
      • • Selection Criteria and Scoring System - Cycle 1
      • • Dual Anonymous Proposals Guide for Reviewers - Cycle 1
      • • Conflicts of Interest - Cycle 1
      • • Galactic/Extragalactic Panel Meetings - Cycle 1
      • • Executive Committee Meeting - Cycle 1
      • • Proposal Feedback Comments - Cycle 1
      • • Confidentiality - Cycle 1
      • • Executive Committee Expert Reviews - Cycle 1
      • Roles & Responsibilities - Cycle 1
        • • Guidelines for Panel Chairs - Cycle 1
        • • Guidelines for Panelists - Cycle 1
        • • Guidelines for Panel Advisors and Observers - Cycle 1
        • • Guidelines for At-Large TAC Members - Cycle 1
        • • Guidelines for Panel Support Scientists - Cycle 1
        • • Guidelines for Levelers - Cycle 1
        • • Guidelines for Science Policy Group (SPG) Members - Cycle 1
      • • Blue Jeans and Slack Guidelines - Cycle 1
      • • Orientation Materials - Cycle 1
      • • Unconscious Bias Training - Cycle 1
      • • Code of Conduct - Cycle 1
      • SPIRIT WebReviewer Tool Guide - Cycle 1
        • • Application Sign-In - Cycle 1
        • • Viewing Panel Assignments and Resources - Cycle 1
        • • Navigating and Viewing Panel Proposals - Cycle 1
        • • Grading by Worksheet - Cycle 1
        • • Entering A Proposal Grade - Cycle 1
        • • Entering A Proposal Review - Cycle 1
        • • Entering Private Notes - Cycle 1
        • • Entering Shared Remarks - Cycle 1
        • • Submitting a Final Review - Cycle 1
        • • Viewing Final Ranking - Cycle 1
        • • Viewing SPIRIT Notifications - Cycle 1
    • Cycle 2 Guaranteed Time Observations Call for Proposals
      • • Cycle 2 GTO Proposal Submission Policies
      • • Cycle 2 GTO Proposal Submission Process
    • Call for Proposals for Cycle 2
      • • New and Important Features - Cycle 2
      • • Proposal Checklist - Cycle 2
      • • Anonymous Proposal Reviews - Cycle 2
      • • Proposal Submission Policies - Cycle 2
      • • Proposal Categories - Cycle 2
      • • Observation Types - Cycle 2
      • • Data Rights and Duplications - Cycle 2
      • • Proposal Selection Procedures - Cycle 2
      • • Guidelines and Checklist for Proposal Preparation - Cycle 2
      • • Filling Out the APT Proposal Form - Cycle 2
      • • Preparation of the PDF Attachment - Cycle 2
      • • Proposal Implementation and Execution - Cycle 2
      • • Grant Funding and Budget Submissions - Cycle 2
      • • Appendix- Scientific Keywords - Cycle 2
    • Peer Review Information - Cycle 2
      • Peer Review Guide - Cycle 2
        • • Discussion Panelists - Cycle 2
        • • External (No Discussion) Panelists - Cycle 2
        • • Executive Committee (Chairs and At-Larges) - Cycle 2
        • • Panel Support Scientists - Cycle 2
        • • Levelers - Cycle 2
      • General Info and Getting Started - Cycle 2
        • • Code of Conduct - Cycle 2
        • • Confidentiality - Cycle 2
        • • Conflicts of Interest - Cycle 2
        • • JWST and its Instruments - Cycle 2
        • • Proposal Types, Sizes and Science Areas - Cycle 2
        • • Tips for a Smooth Review - Cycle 2
        • • Who to Contact for Help - Cycle 2
        • • Orientation Materials - Cycle 2
        • • Unconscious Bias Training - Cycle 2
      • Reviews, Grades and Comments - Cycle 2
        • SPIRIT WebReviewer Tool Guide - Cycle 2
          • • Application Sign-In - Cycle 2
          • • Viewing Panel Assignments and Resources - Cycle 2
          • • Navigating and Viewing Panel Proposals - Cycle 2
          • • Grading by Worksheet - Cycle 2
          • • Entering A Proposal Grade - Cycle 2
          • • Entering A Proposal Review - Cycle 2
          • • Entering Private Notes - Cycle 2
          • • Entering Shared Remarks - Cycle 2
          • • Submitting A Final Review - Cycle 2
          • • Viewing Final Ranking - Cycle 2
          • • Viewing SPIRIT Notifications - Cycle 2
        • • Dual Anonymous Proposals Guide for Reviewers - Cycle 2
        • • Selection Criteria and Scoring System - Cycle 2
        • • Proposal Feedback Comments - Cycle 2
      • Panel Meetings - Cycle 2
        • • Guidelines for Panel Chairs - Cycle 2
        • • Blue Jeans and Slack Guidelines - Cycle 2
        • • Primary, Secondary Reviewers and Graders - Cycle 2
        • • Triage Process and Discussion List - Cycle 2
        • • Preparing for the Panel Meeting - Cycle 2
        • • Discussion Panel Meetings - Cycle 2
        • • Final Ranking - Cycle 2
        • • Large, Treasury and Legacy Proposals - Cycle 2
        • • Executive Committee - Cycle 2
        • • Executive Committee Expert Reviews - Cycle 2
      • STScI Staff - Cycle 2
        • • Role of Panel Support Scientists - Cycle 2
        • • Role of Levelers - Cycle 2
        • • Panel Advisors and Observers - Cycle 2
        • • Science Policies Group (SPG) Members - Cycle 2
    • • Cycle 2 Director's Discretionary (DD) Time Proposals
    • Cycle 3 Guaranteed Time Observations Call for Proposals
      • • Cycle 3 GTO Proposal Submission Policies
      • • Cycle 3 GTO Proposal Submission Process
    • Call for Proposals for Cycle 3
      • • New and Important Features - Cycle 3
      • • Proposal Checklist - Cycle 3
      • • Anonymous Proposal Reviews - Cycle 3
      • • Proposal Submission Policies - Cycle 3
      • • Proposal Categories - Cycle 3
      • • Observation Types - Cycle 3
      • • Data Rights and Duplications - Cycle 3
      • • Proposal Selection Procedures - Cycle 3
      • • Guidelines and Checklist for Proposal Preparation - Cycle 3
      • • Filling Out the APT Proposal Form - Cycle 3
      • • Preparation of the PDF Attachment - Cycle 3
      • • Proposal Implementation and Execution - Cycle 3
      • • Grant Funding and Budget Submissions - Cycle 3
      • • Appendix - Scientific Keywords - Cycle 3
    • Peer Review Information - Cycle 3
      • Peer Review Guide - Cycle 3
        • • Discussion Panelists - Cycle 3
        • • Executive Committee (Chairs and At-Larges) - Cycle 3
        • • External (No Discussion) Panelists - Cycle 3
        • • Panel Support Scientists - Cycle 3
      • General Info and Getting Started - Cycle 3
        • • Code of Conduct - Cycle 3
        • • Confidentiality - Cycle 3
        • • Conflicts of Interest - Cycle 3
        • • JWST and its Instruments - Cycle 3
        • • Proposal Types, Sizes and Science Areas - Cycle 3
        • • Tips for a Smooth Review - Cycle 3
        • • Who to Contact for Help - Cycle 3
        • • Orientation Materials - Cycle 3
        • • Unconscious Bias Training - Cycle 3
      • Reviews, Grades and Comments - Cycle 3
        • SPIRIT WebReviewer Tool Guide - Cycle 3
          • • Application Sign-In - Cycle 3
          • • Viewing Panel Assignments and Resources - Cycle 3
          • • Navigating and Viewing Panel Proposals - Cycle 3
          • • Grading by Worksheet - Cycle 3
          • • Entering A Proposal Grade - Cycle 3
          • • Entering A Proposal Review - Cycle 3
          • • Entering Private Notes - Cycle 3
          • • Entering Shared Remarks - Cycle 3
          • • Submitting A Final Review - Cycle 3
          • • Viewing Final Ranking - Cycle 3
          • • Viewing SPIRIT Notifications - Cycle 3
        • • Dual Anonymous Proposals Guide for Reviewers - Cycle 3
        • • Selection Criteria and Scoring System - Cycle 3
        • • Proposal Feedback Comments - Cycle 3
      • Panel Meetings - Cycle 3
        • • Guidelines for Panel Chairs - Cycle 3
        • • Blue Jeans and Slack Guidelines - Cycle 3
        • • Primary, Secondary Reviewers and Graders - Cycle 3
        • • Triage Process and Discussion List - Cycle 3
        • • Preparing for the Panel Meeting - Cycle 3
        • • Discussion Panel Meetings - Cycle 3
        • • Final Ranking - Cycle 3
        • • Large, Treasury and Legacy Proposals - Cycle 3
        • • Executive Committee - Cycle 3
        • • Executive Committee Expert Reviews - Cycle 3
      • STScI Staff - Cycle 3
        • • Role of Panel Support Scientists - Cycle 3
        • • Panel Advisors and Observers - Cycle 3
        • • Science Policies Group (SPG) Members - Cycle 3

Observatory

  • Observatory Hardware
    • • Observatory Hardware Overview
    • Telescope
      • • Focal Plane
      • • Wavefront Sensing and Control
    • Attitude Control Subsystem
      • • Momentum Management
    • • Fine Guidance Sensor
    • Target Observability and Observatory Coordinate System
      • • Instrument Ideal Coordinate Systems
    • • Integrated Science Instrument Module
    • • Solid State Recorder
    • Spacecraft Bus
      • • Communications Subsystem
      • • Propulsion

  • Observatory Characteristics and Performance
    • Optics Performance and Stability
      • • STPSF (formerly WebbPSF)
    • Pointing Performance
      • • Pointing Accuracy
      • • Fine Guide Stability
      • Guide Stars
        • • Guide Star Catalog Updates
        • • Guiding Strategies and Challenging Fields
      • • Dither Precision
      • • Guiding on Moving Targets
    • • Orbit
    • • Position Angles, Ranges, and Offsets
    • Target Viewing Constraints
      • • Field of Regard (FoR)
      • • Continuous Viewing Zone (CVZ)
      • • Field of View
      • • Micrometeoroid Avoidance Zone

Instruments

  • Mid Infrared Instrument
    • Observing Modes
      • • Imaging
      • • Coronagraphic Imaging
      • • Medium Resolution Spectroscopy
      • • Low Resolution Spectroscopy
      • Time-Series Observations
        • • Imaging TSOs
        • • LRS TSOs
        • • MRS TSOs
    • Instrumentation
      • • Optics and Focal Plane
      • • MRS Field and Coordinates
      • • Filters and Dispersers
      • • Coronagraphs
      • • Spectroscopic Elements
      • Detector Overview
        • Detector Readout Overview
          • • Detector Readout FASTR1
          • • Detector Readout SLOWR1
          • • Comparison of Old and New Detector Readout Patterns
        • • Detector Performance
        • • Detector Subarrays
    • Operations
      • Target Acquisition
        • • Imaging Target Acquisition
        • • Coronagraphic Imaging Target Acquisition
        • • LRS Slit Target Acquisition
        • • LRS Slitless Target Acquisition
        • • MRS Target Acquisition
      • Dithering
        • • Imaging Dithering
        • • Coronagraphic Imaging Dithering
        • • LRS Dithering
        • • MRS PSF and Dithering
        • • MRS Dedicated Sky Observations
      • Mosaics
        • • Imaging Mosaics
        • • Knife Edge Gap in Imaging Mosaics
        • • LRS Mosaics
        • • MRS Mosaics
      • • Parallel Observations
      • • MRS Simultaneous Imaging
    • Performance
      • • Sensitivity
      • • Bright Source Limits
      • • Point Spread Functions
    • APT Templates
      • • Imaging APT Template
      • • LRS APT Template
      • • MRS APT Template
      • • Coronagraphic Imaging APT Template
    • Observing Strategies
      • • Cross-Mode Recommended Strategies
      • • Imaging Recommended Strategies
      • • Coronagraphic Recommended Strategies
      • • LRS Recommended Strategies
      • • MRS Recommended Strategies
      • • TSO Recommended Strategies
    • Example Science Programs
      • MRS Spectroscopy of a Late M Star
        • • Step-by-Step ETC Guide for MRS Spectroscopy of a Late M Star
        • • Step-by-Step APT Guide for MRS Spectroscopy of a Late M Star
      • MIRI MRS and NIRSpec IFU Observations of Cassiopeia A
        • • Step-by-Step ETC Guide for MIRI MRS and NIRSpec IFU Observations of Cassiopeia A
        • • Step-by-Step APT Guide for MIRI MRS and NIRSpec IFU Observations of Cassiopeia A
      • MIRI and NIRCam Coronagraphy of HR8799 b
        • • Step-by-Step ETC Guide for MIRI and NIRCam Coronagraphy of HR8799 b
        • • Step-by-Step APT Guide for MIRI and NIRCam Coronagraphy of HR8799 b
      • MIRI and NIRCam Coronagraphy of the Beta Pictoris Debris Disk
        • • Step-by-Step ETC Guide for MIRI and NIRCam Coronagraphy of the Beta Pictoris Debris Disk
        • • Step-by-Step APT Guide for MIRI and NIRCam Coronagraphy of the Beta Pictoris Debris Disk
    • • Technical Library

  • Near Infrared Camera
    • Observing Modes
      • • Imaging
      • • Coronagraphic Imaging
      • Time-Series Observations
        • • Time-Series Imaging
        • • Grism Time Series
        • • Short Wavelength Grism Time Series
      • • Wide Field Slitless Spectroscopy
    • Instrumentation
      • • Field of View
      • • Modules
      • • Optics
      • • Dichroics
      • • Pupil and Filter Wheels
      • • Filters
      • • Coronagraphic Occulting Masks and Lyot Stops
      • • Filters for Coronagraphy
      • • Grisms
      • • Weak Lenses
      • Detector Overview
        • Detector Subarrays
          • • Multistripe Subarrays for Grism Time Series Spectroscopy
        • • Detector Readout
        • • Detector Readout Patterns
        • • Detector Performance
    • Operations
      • Dithers and Mosaics
        • • Primary Dithers
        • • Subarray Primary Dithers
        • • Wide Field Slitless Spectroscopy Dithers
        • Subpixel Dithers
          • • Standard Subpixel Dithers
          • • Small Grid Dithers
        • • Mosaics
      • • Coronagraphic PSF Estimation
      • • Coronagraph Astrometric Confirmation Images
      • • Apertures
      • Target Acquisition
        • • Coronagraphic Target Acquisition
        • • Grism Time-Series Target Acquisition
        • • Time-Series Imaging Target Acquisition
    • Performance
      • • Point Spread Functions
      • Sensitivity
        • • Imaging Sensitivity
      • • Bright Source Limits
      • • Persistence
      • • Flat Fields
      • • WFSS Field of View
      • • WFSS Backgrounds
      • • Absolute Flux Calibration and Zeropoints
    • APT Templates
      • • Imaging APT Template
      • • Coronagraphic Imaging APT Template
      • • Time-Series APT Template
      • • Grism Time-Series APT Template
      • • Wide Field Slitless Spectroscopy APT Template
    • Observing Strategies
      • • Imaging Recommended Strategies
      • • Coronagraphic Imaging Recommended Strategies
      • Time-Series Observation Recommended Strategies
        • • Short Wavelength Grism Time Series Observing Strategies
      • • WFSS Recommended Strategies
      • • Rogue Path Planning Tool for Avoiding 'Claws' Artifacts
    • Example Science Programs
      • NIRCam Deep Field Imaging with MIRI Imaging Parallels
        • • Step-by-Step ETC Guide for NIRCam Deep Field Imaging with MIRI Imaging Parallels
        • • Step-by-Step APT Guide for NIRCam Deep Field Imaging with MIRI Imaging Parallels
      • NIRCam Parallel Imaging and NIRISS WFSS of Galaxies in Lensing Clusters
        • • Step-by-Step ETC Guide for NIRCam Parallel Imaging and NIRISS WFSS of Galaxies in Lensing Clusters
        • • Step-by-Step APT Guide for NIRCam Parallel Imaging and NIRISS WFSS of Galaxies in Lensing Clusters
      • WFSS Deep Galaxy Observations
        • • Step-by-Step ETC Guide for WFSS Deep Galaxy Observations
        • • Step-by-Step APT Guide for WFSS Deep Galaxy Observations
      • NIRCam and MIRI Coronagraphy of HR8799 b
        • • Step-by-Step ETC Guide for NIRCam and MIRI Coronagraphy of HR8799 b
        • • Step-by-Step APT Guide for NIRCam and MIRI Coronagraphy of HR8799 b
      • NIRCam and MIRI Coronagraphy of the Beta Pictoris Debris Disk
        • • Step-by-Step ETC Guide for NIRCam and MIRI Coronagraphy of the Beta Pictoris Debris Disk
        • • Step-by-Step APT Guide for NIRCam and MIRI Coronagraphy of the Beta Pictoris Debris Disk
      • Grism Time-Series Observations of GJ 436b
        • • Step-by-Step ETC Guide for Grism Time-Series of GJ 436b
        • • Step-by-Step APT Guide for Grism Time-Series of GJ 436b

  • Near Infrared Imager and Slitless Spectrograph
    • Observing Modes
      • • Wide Field Slitless Spectroscopy
      • • Single Object Slitless Spectroscopy
      • • Aperture Masking Interferometry
      • • Imaging
    • Instrumentation
      • • Optics and Focal Plane
      • • Pupil and Filter Wheels
      • • Filters
      • • GR150 Grisms
      • • GR700XD Grism
      • • Non-Redundant Mask
      • Detector Overview
        • • Detector Subarrays
        • • Detector Readout
        • • Detector Readout Patterns
        • • Detector Performance
    • Operations
      • Dithers
        • • AMI Dithers
        • • Imaging Dithers
        • • WFSS Dithers
      • • Target Acquisition
      • • Apertures
      • • Mosaics
    • Performance
      • • Sensitivity
      • • Bright Limits
      • • Point Spread Functions
      • • Ghosts
    • APT Templates
      • • Imaging APT Template
      • • Wide Field Slitless Spectroscopy APT Template
      • • Single-Object Slitless Spectroscopy APT Template
      • • Aperture Masking Interferometry APT Template
    • Observing Strategies
      • • Generic Recommended Strategies
      • • WFSS Recommended Strategies
      • • SOSS Recommended Strategies
      • • AMI Recommended Strategies
      • • Imaging Recommended Strategies
    • Example Science Programs
      • AMI Observations of Extrasolar Planets Around a Host Star
        • • Step-by-Step ETC Guide for AMI Observations of Extrasolar Planets Around a Host Star
        • • Step-by-Step APT Guide for AMI Observations of Extrasolar Planets Around a Host Star
      • SOSS Time-Series Observations of a Transiting Exoplanet
        • • Step-by-Step ETC Guide for SOSS Time-Series Observations of a Transiting Exoplanet
        • • Step-by-Step APT Guide for SOSS Time-Series Observations of a Transiting Exoplanet
      • NIRISS WFSS with NIRCam Parallel Imaging of Galaxies in Lensing Clusters
        • • Step-by-Step ETC Guide for NIRISS WFSS and Parallel NIRCam Imaging of Galaxies in Lensing Clusters
        • • Step-by-Step APT Guide for NIRISS WFSS and NIRCam Parallel Imaging of Galaxies in Lensing Clusters
    • • Technical Library

  • Near Infrared Spectrograph
    • Observing Modes
      • • Multi-Object Spectroscopy
      • • IFU Spectroscopy
      • • Fixed Slits Spectroscopy
      • • Bright Object Time-Series Spectroscopy
    • Instrumentation
      • • Optics
      • • Dispersers and Filters
      • Detectors
        • • Detector Performance
        • • Detector Readout
        • Detector Readout Modes and Patterns
          • • Traditional Detector Readout Mode
          • • IRS2 Detector Readout Mode
        • • Detector Subarrays
      • • Micro-Shutter Assembly
      • • Integral Field Unit
      • • Fixed Slits
    • Operations
      • Target Acquisition
        • • MSA Target Acquisition
        • • Verify Only Target Acquisition
        • • Wide Aperture Target Acquisition
      • Dithers and Nods
        • • MOS Dither and Nod Patterns
        • • IFU Dither and Nod Patterns
        • • FS Dither and Nod Patterns
      • MOS Operations
        • • MOS and MSATA Observing Process
        • • Resources for MOS and MSATA Program Updates
        • MOS Operations - Catalogs and Images
          • • Hubble Space Telescope Finder Images and Catalogs
        • • MOS Operations - Pre-Imaging Using NIRCam
        • • MOS Operations - Confirmation Images
        • • MOS Operations - Slit Losses
        • • MOS Wavelength Ranges and Gaps
        • • MSA Shutter Operability
      • IFU Operations
        • • MSA Leakage Correction for IFU Observations
        • • IFU Wavelength Ranges and Gaps
      • FS Operations
        • • FS Wavelength Ranges and Gaps
      • BOTS Operations
        • • BOTS Wavelength Ranges and Gaps
      • • Auto-Cals
    • Performance
      • • Bright Source Limits
      • • Sensitivity
    • APT Templates
      • Multi-Object Spectroscopy APT Template
        • • MSA Planning Tool, MPT
        • MPT - Catalogs
          • • MPT Catalogs - Examples
        • • MPT - Planner
        • • MPT - Plans
        • • MPT - MOS and MSATA Program Updates
        • • MPT - Computational Performance
        • • Custom MOS Observations using the MSA Configuration Editor
        • • Long Slit MOS Observations
        • • MSA Target Info File
        • • MPT - Parameter Space
      • • IFU Spectroscopy APT Template
      • • Fixed Slit Spectroscopy APT Template
      • • Bright Object Time-Series APT Template
      • • FS and IFU Mosaic APT Guide
    • Observing Strategies
      • • Background Recommended Strategies
      • • Bright Spoilers and the IFU Recommended Strategies
      • • Detector Recommended Strategies
      • • Dithering Recommended Strategies
      • • MOS Recommended Strategies
      • • MSA Leakage Subtraction Recommended Strategies
      • MSATA Reference Star Selection Recommended Strategies
        • • Predicting MSATA Reference Star Magnitudes
      • • Target Acquisition Recommended Strategies
    • Example Science Programs
      • NIRSpec IFU and MIRI MRS Observations of Cassiopeia A
        • • Step-by-Step ETC Guide for NIRSpec IFU and MIRI MRS Observations of Cassiopeia A
        • • Step-by-Step APT Guide for NIRSpec IFU and MIRI MRS Observations of Cassiopeia A
      • IFU and Fixed Slit Observations of Near-Earth Asteroids
        • • Step-by-Step ETC Guide for IFU and Fixed Slit Observations of Near-Earth Asteroids
        • • Step-by-Step APT Guide for IFU and Fixed Slit Observations of Near-Earth Asteroids
      • BOTS Observations of WASP-79b
        • • Step-by-Step ETC Guide for BOTS Observations of WASP-79b
        • • Step-by-Step APT Guide for BOTS Observations of WASP-79b
      • MOS Deep Extragalactic Survey
        • • Step-by-Step ETC Guide for  MOS Deep Extragalactic Survey
        • • Step-by-Step APT Guide for  MOS Deep Extragalactic Survey
    • • Technical Library

Proposal Preparation

  • • Getting Started with Planning JWST Observations

  • • Understanding Exposure Times

  • JWST General Support
    • Background Model
      • • Background Variability
      • • Background-Limited Observations
    • • Mosaic Overview
    • • Dithering Overview
    • Observing Overheads and Time Accounting Overview
      • • Observing Overheads Summary
      • • Slew Times and Overheads
      • • Instrument Overheads
    • • Data Volume and Data Excess

  • Methods and Roadmaps
    • Imaging
      • • Imaging Roadmap
    • Slit Spectroscopy
      • • Slit Spectroscopy Roadmap
    • Wide Field Slitless Spectroscopy
      • • Wide Field Slitless Spectroscopy Roadmap
    • High-Contrast Imaging
      • • High-Contrast Imaging Roadmap
      • High-Contrast Imaging Proposal Planning
        • • HCI ETC Instructions
        • • HCI APT Instructions
        • • HCI Small Grid Dithers
        • HCI Coronagraphic Sequences
          • • HCI APT Coronagraphic Sequence Examples
        • • HCI PSF Reference Stars
      • High-Contrast Imaging Supporting Technical Information
        • • HCI Optics
        • • HCI Inner Working Angle
        • HCI Contrast Considerations
          • • HCI MIRI Limiting Contrast
          • • HCI NIRCam Limiting Contrast
          • • HCI NIRISS Limiting Contrast
    • Integral Field Spectroscopy
      • • Integral Field Spectroscopy Roadmap
      • • Integral Field Spectroscopy Terminology
    • Multi-Object Spectroscopy
      • • Multi-Object Spectroscopy Roadmap
      • • Comparing Multi-Object Spectroscopy with different Instruments
    • Time-Series Observations
      • • Time-Series Observations Roadmap
      • • Time-Series Observations Noise Sources
      • • Time-Series Observations TSO Saturation
      • • Time-Series Observations Known Issues
    • Moving Target Observations
      • • Moving Target Roadmap
      • Moving Target Proposal Planning
        • • Moving Target Acquisition and Tracking
        • • Moving Target ETC Instructions
        • Moving Target APT Instructions
          • • Tutorial on Creating Solar System Targets in APT
          • • Tutorial on Creating Solar System Observations in APT
          • • Tutorial on Visualizing Solar System Observations in APT
        • • Moving Target Observing Strategies
      • Moving Target Supporting Technical Information
        • • Moving Target Overheads
        • • Moving Target Field of Regard
        • • Moving Target Ephemerides
        • • Moving Target Scattered Light Considerations
        • • Moving Target Policies
    • Parallel Observations
      • • Coordinated Parallels Roadmap
      • Coordinated Parallels Custom Dithers
        • • Coordinated Parallel Dither Tables
    • Target of Opportunity Observations
      • • Target of Opportunity Roadmap

  • • Example Science Programs

  • • Recommended Observing Strategies

  • Observation Duplication Checking
    • • Identifying Potential JWST Duplicate Observations

  • • Acronyms and Abbreviations

Proposing Tools

  • Exposure Time Calculator Overview
    • • New User Guide
    • Scenes and Sources Page Overview
      • • Defining a New Source
      • • Defining an Extended Source
      • • Point Spread Functions
      • • Defining a New Scene
      • • Source Spectral Energy Distributions
      • • User Supplied Spectra
    • Calculations Page Overview
      • • Creating a New Calculation
      • • Backgrounds
      • • Wavelength of Interest
      • • Batch Expansions
      • Strategies
        • • Imaging Aperture Photometry Strategy
        • • Aperture Spectral Extraction Strategy
        • • MSA Full Shutter Extraction Strategy
        • • IFU Strategies
        • • SOSS Spectral Extraction Strategy
        • • Coronagraphy Strategy
        • • MSA Aperture Photometry Strategy
        • • MSA Shutter Photometry Strategy
        • • Target Acquisition Strategy
      • Target Acquisition
        • • MIRI Target Acquisition
        • • NIRCam Target Acquisition
        • • NIRISS Target Acquisition
        • • NIRSpec Target Acquisition
      • • Cosmic Ray Implementation
      • • Saturation
      • • Residual Flat Field Errors
      • • Time-Series Modes
      • • Readout Patterns
      • • NIRCam Coronagraphic Imaging
    • Outputs Overview
      • • Images and Plots
      • • Reports
      • • Downloads
      • • Integrated Emission Line SNR
    • Workbooks Overview
      • • Using the Sample Workbooks
      • • Sharing Workbooks
    • Pandeia Engine Tutorial
      • • Installing Pandeia
      • • Pandeia Quickstart
      • • Pandeia Reference Data
      • • Pandeia Configuration Dictionaries
      • • Pandeia Order of Operations
      • • Pandeia Reports
      • • Pandeia Batch Mode
      • • Pandeia Guides and Examples
      • • Pandeia Backgrounds
      • • Instrument Throughputs
    • • Video Tutorials

  • JWST Astronomers Proposal Tool Overview
    • Workflow Articles
      • • Proposal Information
      • Targets
        • • Specifying Background Targets
        • • Bulk Target Ingest
      • • Observations
      • • Special Requirements
      • • Micrometeoroid Avoidance
      • • Target Acquisition
      • Visit Planner
        • • Visit Planner Constraints
      • • Smart Accounting
      • • Target Confirmation Charts
      • • Submitting Your Proposal
    • Additional APT Functionality
      • Mosaic Planning
        • • Mosaic Tile Splitting Activity
        • • Simple Mosaic Example
      • • Graphical Timeline
      • • Aladin Viewer
      • • Visit Splitting
      • • Coordinated Parallel Observations
      • • Pure Parallel Observations
      • • Export Files
    • APT Help
      • • Video Tutorials

  • • APT Observation Templates

  • ETC to APT Interface
    • • APT-ETC Connectivity

  • Other Tools
    • • Backgrounds Tool
    • Target Visibility Tools
      • • General Target Visibility Tool Help
      • • Moving Target Visibility Tool Help
      • • Coronagraphic Visibility Tool Help
    • • Interactive Sensitivity Tool
    • • MIRAGE Data Simulator
    • Exoplanet Observations Proposal Tools
      • • Groups and Integrations Tool
      • • Contamination Overlap Tool
      • • Forward Modeling Tool
      • • Limb Darkening Calculator Tool
      • • Phase Constraint Calculator Tool
      • • Exoplanet ETC, PandExo
    • • NIRSpec Observation Visualization Tool Help
    • • NIRCam Rogue Path Planning Tool for Avoiding "Claws" Artifacts

  • • Proposal Planning Video Tutorials

Observing Process

  • Observing with JWST
    • • Pure Parallel Program Observation Specfication

Data

  • • Getting Started with JWST Data

  • Accessing JWST Data
    • Science Data Overview
      • • Time Definitions
    • • MAST Web Access
    • • MAST API Access
    • • Exclusive Access Period
    • • Citing JWST Data
    • • Simulated JWST Data

  • Science Calibration Pipeline
    • Stages of Data Processing
      • • calwebb_detector1
      • • calwebb_image2
      • • calwebb_spec2
      • • calwebb_ami3
      • • calwebb_coron3
      • • calwebb_image3
      • • calwebb_spec3
      • • calwebb_tso3
    • • CRDS Migration to Quarterly Calibration Updates
    • Operations Pipeline Build Information
      • • Operations Pipeline Build 11.3 Release Notes
      • • Operations Pipeline Build 11.2 Release Notes
      • • Operations Pipeline Build 11.1 Release Notes
      • • Operations Pipeline Build 11.0 Release Notes
      • • Operations Pipeline Build 10.2 Release Notes
      • • Operations Pipeline Build 10.1 Release Notes
      • • Operations Pipeline Build 10.0 Release Notes
      • • Operations Pipeline Build 9.3 Release Notes
      • • Operations Pipeline Build 9.2 Release Notes
      • • Operations Pipeline Build 9.1 Release Notes
      • • Operations Pipeline Build 9.0 Release Notes
      • • Operations Pipeline Build 8.1.2 Release Notes
      • • Operations Pipeline Build 8.1.1 Release Notes
      • • Operations Pipeline Build 8.0.1 Release Notes
      • • Operations Pipeline Build 8.0 Release Notes
    • • Running the Science Calibration Pipeline
    • • Pipeline Notebooks
    • • Tips and Tricks for Working with the Pipeline
    • • Key Differences for Time Series Observations
    • • Key Differences for Moving Target Observations

  • Calibration Status
    • • Absolute Flux Calibration
    • MIRI Calibration Status
      • • MIRI Coronagraphy Calibration Status
      • • MIRI Imaging Calibration Status
      • • MIRI LRS Calibration Status
      • • MIRI MRS Calibration Status
    • NIRCam Calibration Status
      • • NIRCam Coronagraphy Calibration Status
      • • NIRCam Imaging Calibration Status
      • • NIRCam WFSS and Grism Calibration Status
    • NIRISS Calibration Status
      • • NIRISS AMI Calibration Status
      • • NIRISS Imaging Calibration Status
      • • NIRISS SOSS Calibration Status
      • • NIRISS WFSS Calibration Status
    • NIRSpec Calibration Status
      • • NIRSpec Calibration Concept
      • • NIRSpec Instrument Model Calibration Status
      • • NIRSpec IFU Calibration Status
      • • NIRSpec Fixed Slit Calibration Status
      • • NIRSpec MOS Calibration Status
      • • NIRSpec BOTS Calibration Status

  • Known Issues with JWST Data
    • • Known Issues with JWST Data - High-Level Summary
    • • Shower and Snowball Artifacts
    • • 1/f Noise
    • MIRI Known Issues
      • • MIRI Coronagraphy Known Issues
      • • MIRI Imaging Known Issues
      • • MIRI LRS Known Issues
      • • MIRI MRS Known Issues
      • • MIRI Time-Series Observations Known Issues
    • NIRCam Known Issues
      • • NIRCam Coronagraphy Known Issues
      • • NIRCam Imaging Known Issues
      • • NIRCam Time-Series Known Issues
      • • NIRCam WFSS Known Issues
      • • NIRCam Scattered Light Artifacts
      • NIRCam 1/f Noise Removal Methods
        • • Alternative 1/f Noise Software Packages
    • NIRISS Known Issues
      • • NIRISS 1/f Noise Removal
      • • NIRISS AMI Known Issues
      • • NIRISS Imaging Known Issues
      • • NIRISS SOSS Known Issues
      • • NIRISS WFSS Known Issues
    • NIRSpec Known Issues
      • • NIRSpec IFU Known Issues
      • • NIRSpec MOS Known Issues
      • • NIRSpec FS Known Issues
      • • NIRSpec BOTS Known Issues

  • Post-Pipeline Data Analysis
    • • Jdaviz Tutorials
    • • JWebbinars

Menu Browse JWST Docs

Welcome to the

JWST User Documentation Homepage


This website holds a comprehensive collection of documentation (known as JDox) on the JWST spacecraft and instruments, preparing observing proposals, and getting started on data analysis.

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Latest JDox Updates
Video Tutorials
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About JWST

Hardware

Characteristics

General Support

Instruments

Mid Infrared Instrument

Near Infrared Camera

Near Infrared Imager and Slitless Spectrograph

Near Infrared Spectrograph

Proposing Tools

Exposure Time Calculator

Astronomer's Proposal Tool

Other Tools

For Proposers

Getting Started

Opportunities and Policies

Methods and Roadmaps

Recommended Observing Strategies

Example Science Programs

Duplication Checking

Data

Getting Started

Accessing JWST Data

Science Calibration Pipeline

Calibration Status

Known issues with JWST Data

Post-Pipeline Data Analysis



Additional Resources

JWST for Scientists Website

JWST Observer YouTube Channel

JWST Pocket Guide

Technical Reports

 "Read the Docs" (Data Calibration and Analysis)

Mikulski Archives





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