JWST JDox Latest Updates
Lists of recently updated articles in the JWST User Documentation (JDox) website are provided in this page.
On this page
New JDox articles since January 1, 2024
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JWST Call for Proposals for Cycle 4 and its associated pages |
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Articles about the JWST observatory—under JWST Observatory Hardware and JWST Observatory Characteristics and Performance—have been extensively reorganized, including the addition of new pages. Articles with new content include: |
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The JWST Data articles have been extensively reorganized, including the addition of new pages and some depreciated pages |
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Notable updates to JDox articles since Jan 1, 2024
Updated
| Article | Updated on | Update description |
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| Proposing Opportunities | ||
| Cycle 3 Director's Discretionary (DD) Time Proposals | | Clarifications made for types of DDT proposals| |
| JWST New and Important Features | | Added information regarding the new Discovery DD time proposals |
| Instruments → MIRI | ||
| Step-by-Step APT Guide for MIRI MRS and NIRSpec IFU Observations of Cassiopeia A |
| Updated language to match APT 2024.5 |
| JWST Mid Infrared Instrument |
| Updated PCE plots (Figures 3, 4, 6) using ETC 4.0 for Cycle 4. Updated sensitivity plots using ETC 4.0 for Cycle4 |
| MIRI Sensitivity |
| Updated table and plot based on ETC 4.0 |
| Added section on imaging time dependent sensitivity | |
| MIRI Bright Source Limits |
| Tables and plot updated for Cycle 4 based on ETC 4.0 |
| MIRI Filters and Dispersers |
| Updated PCE plots (Figures 2, 3, 5) for Cycle 4. |
| MIRI LRS Slit Target Acquisition |
| Added section on TA verification image |
| Updated information on offset TA target distance | |
| MIRI LRS Slitless Target Acquisition |
| Added information about TA verification image |
| MIRI LRS APT Template |
| Updates to reflect cycle 4 changes to LRS slitless TA |
| MIRI Imaging Recommended Strategies |
| Removed the dwell time section, as this is covered in the cross-mode recommendations page. |
| Made correction to recommendation comments in Table 2 Removed reference to ground test data, which is superseded by in-flight experience | |
| MIRI Coronagraphic Imaging APT Template |
| Added text to indicate that offset TA is now allowed for MIRI coronagraphy |
| MIRI Cross-Mode Recommended Strategies |
| Updated with recommendations relating to FASTR1 and SLOWR1 readout modes |
| MIRI Parallel Observations |
| Added full list of supported coordinated parallel modes Removed outdated content and added additional links to complementary pages |
| MIRI Imaging Target Acquisition |
| Imaging TA is not supported |
| MIRI LRS TSOs |
| Added exposure limitations information, subarray comments |
| MIRI Imaging TSOs |
| Updated target acquisition and dithering sections, added exposure time limitations |
| MIRI Coronagraphic Imaging Target Acquisition |
| Added new section to indicate that offset-TAs are now possible for coronagraphic observations |
| MIRI Imaging Dithering |
| Cycling is now default pattern |
| MIRI TSO Recommended Strategies |
| Added new info on verification images |
| MIRI LRS Recommended Strategies |
| Added new information for verification image |
| Instruments → NIRCam | ||
| NIRCam Detector Readout Patterns |
| Added MEDIUMDEEP patterns |
| NIRCam Imaging APT Template |
| Added two new readout patterns to Table 2, MEDIUMDEEP2 and MEDIUMDEEP8 |
| NIRCam Grism Time-Series APT Template |
| Updated page to include information about new SW grism time-series mode |
| Step-by-Step ETC Guide for NIRCam Parallel Imaging and NIRISS WFSS of Galaxies in Lensing Clusters |
| Updated to be consistent with sensitivity values for ETC v. 4.0 |
| Step-by-Step APT Guide for NIRCam Parallel Imaging and NIRISS WFSS of Galaxies in Lensing Clusters |
| Updated to be consistent with APT 2024.5. |
| NIRCam Bright Source Limits |
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| NIRCam Detector Subarrays |
| Added pointers to the SW grism time-series and NIRCam multistripe subarrays articles |
| NIRCam Grism Time Series |
| Updated text for synergy with new SW grism time-series page |
| NIRCam Imaging Sensitivity |
| ETC v4 update to Figure 1 depths |
| NIRCam Imaging |
| ETC v4 updates to sensitivity & saturation plots |
| NIRCam Observing Modes |
| Noted extended wavelength coverage and resolving power for grism time series due to the addition of DHS grisms in the SW channel. |
| NIRCam Persistence |
| Added description of observational strategy for persistence mitigation of SPR beginning in Cycle 3. Reorganized existing text and figures and re-cast them as an"Analytical Strategy for Persistence Mitigation." |
| NIRCam Sensitivity |
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| NIRCam Time-Series Imaging |
| ETC v4 updates to saturation plots |
| NIRCam Time-Series Observation Recommended Strategies |
| Updated text for synergy with new SW Grism Time Series page |
| NIRCam Time-Series Observations |
| Includes mention of DHS as a short wavelength grism time-series mode |
| NIRCam Wide Field Slitless Spectroscopy |
| Sensitivity plots were updated with ETC v4 |
| NIRCam Coronagraphic Imaging Recommended Strategies |
| Added references and notes on imaging point sources inside IWA |
| NIRCam Grism Time-Series Target Acquisition |
| Figure 1 updated to show LW grism pairing with SW grism or SW imaging |
| NIRCam Apertures |
| All values updated to reflect current distortion and relative alignment knowledge based on all Cycle 1 calibration data. |
| JWST Near Infrared Camera |
| Added information on using the DHS for grism time series
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| NIRCam Detector Readout |
| Added pointers to information about the multistripe subarrays used for SW grism time series. |
| NIRCam Filters for Coronagraphy |
| Added a reference (Girard et al.) and Figure 1 |
| NIRCam Subarray Primary Dithers |
| Updated to make it clearer that this is a legacy dither pattern, and that the STANDARD dither pattern is recommended instead. |
| Step-by-Step ETC Guide for NIRCam Deep Field Imaging with MIRI Imaging Parallels |
| Updated for ETC v3.2 |
| Step-by-Step APT Guide for NIRCam Deep Field Imaging with MIRI Imaging Parallels |
| Updated the position angle to avoid the MAZ and updated charged time to results from APT 2024.1. |
| NIRCam Flat Fields |
| Added Technical Report reference for Cycle 1 flat field updates. |
| NIRCam Filters |
| Updated throughput curves, figures, and table values with latest results |
| NIRCam Target Acquisition |
| Added details about box sizes |
| Instruments → NIRISS | ||
| NIRISS Aperture Masking Interferometry APT Template |
| Updated for APT 2024.5 to account for the new way of specifying optional direct images for an AMI exposure |
| Step-by-Step ETC Guide for NIRISS AMI Observations of Extrasolar Planets Around a Host Star |
| Updated for ETC 4.0 (new charge migration signal limit) and to use the recommended 5-step subpixel dither pattern |
| Step-by-Step APT Guide for NIRISS AMI Observations of Extrasolar Planets Around a Host Star |
| Updated for ETC 4.0 (new charge migration signal limit) and to use the recommended 5-step subpixel dither pattern |
| NIRISS SOSS Time-Series Observations of a Transiting Exoplanet |
| Updated to add optional F277W+GR700XD exposure |
| Step-by-Step ETC Guide for NIRISS SOSS Time-Series Observations of a Transiting Exoplanet |
| Updated to add an ETC calculation for an exposure with the F277W filter |
| Step-by-Step APT Guide for NIRISS SOSS Time-Series Observations of a Transiting Exoplanet |
| Updated to add optional F277W exposure |
| Step-by-Step ETC Guide for NIRISS WFSS and Parallel NIRCam Imaging of Galaxies in Lensing Clusters |
| Updated to be consistent with sensitivity values for ETC v. 4.0 |
| Step-by-Step APT Guide for NIRISS WFSS and NIRCam Parallel Imaging of Galaxies in Lensing Clusters |
| Updated to be consistent with APT 2024.5 |
| NIRISS Bright Limits |
| Updated bright limits to be consistent with ETC v. 4.0. AMI bright limits are changed due to a charge migration signal limit update from 20,000 e- to 26,000 e-. The WFSS and Imaging bright limits were updated due to a signal limit decrease from 72,000 e- (full well depth assumed for the ETC) to 34,4000 e- (charge migration signal limit for imaging and WFSS in the F090W filter). SOSS bright limits are unchanged. |
| NIRISS Imaging Recommended Strategies |
| Updated for Cycle 4 to note that the ETC v. 4.0 uses the charge migration signal limit to determine (effective) "saturation" in a NIRISS calculation for imaging. |
| NIRISS Sensitivity |
| Updated to match ETC 4.0 sensitivities where new PSFs were created to include effects of IPC and an updated background model was implemented. Imaging sensitivities changed by several percent in the long wavelength filters due to changes in the background. |
| NIRISS AMI Recommended Strategies |
| Updated charge migration signal limit to 26,000e- based on measurements from in-flight data in the F480M filter. Removed discussion about filter-dependent offsets after TA since these offsets are now applied automatically by APT. |
| NIRISS SOSS Recommended Strategies |
| Added information about obtaining optional SOSS background exposures. |
| Added some more information about obtaining an optional F277W+GR700XD exposure. | |
| NIRISS WFSS Recommended Strategies |
| Updated for Cycle 4 to note that the ETC v. 4.0 uses the charge migration signal limit to determine (effective) "saturation" in a NIRISS calculation for WFSS. |
| NIRISS Wide Field Slitless Spectroscopy APT Template |
| Updated to add note about average pixel scale in the dithers section. Renamed "Science Observation" heading to "Science (Grism) Exposures" to be consistent with wording used as of APT version 2024.3. |
| NIRISS WFSS Dithers |
| Updated to quote average pixel scale of NIRISS in the dithers section. Also noted that a minimum of 4 dither steps is recommended. |
| NIRISS Dithers |
| Updated to note that 5-point SUBPIXEL dithering is recommended for the AMI mode. |
| NIRISS Operations |
| Updated to note that the 5-point subpixel dither pattern is recommended for the AMI mode. |
| NIRISS Point Spread Functions |
| Updated to highlight time-dependence of OPD files available in WebbPSF |
| NIRISS GR150 Grisms |
| Updated to plot the Photon-to-electron conversion efficiency rather than the grism only throughputs. Also provided data files for the PCE curves. |
| NIRISS GR700XD Grism |
| Updated to show the Photon-to-electron conversion efficiency curves for GR700XD rather than grism-only throughput. Also uploaded the data file for the curves. |
| Instruments → NIRSpec | ||
| Updated language to match APT 2024.5 | |
| Added section on adding a Leakage exposure in APT | |
| Changed TA exposure time to match ETC V4.0 | |
| IFU, MOS, and FS limiting sensitivity figures replaced and text edited for ETC v4.0 | |
| FS, MOS, and IFU bright limits figures updated for ETC 4.0 | |
| Updated WATA brightness limit table and other magnitudes for ETC v4.0 | |
| Table 3 revised for ETC v4.0. | |
| Updated Table 2 and text for IFU 4-point nod for implementation in ETC v4.0 | |
| Added text to attention box stating that the number of sources can have decreased slightly due to increased distance between spectra in the dispersion direction. | |
| Updated text regarding operability and model updates after commissioning. | |
| Clarified that APA restrictions should be present in the proposal submission | |
| Clarified recommendations about adding an APA special requirement, but only if necessary. | |
| Updated numbers for shutter operability and replaced Fig 5, based on March 2024 results of Peter Zeidler | |
| Clarified the addition of an APA special requirement at proposal submission. | |
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| Corrected text for grating-filter combinations and added text for non-science target WATA source. | |
| Updates to G235H and G395H dispersion fits files | |
| Candidate sets can now be filtered by coordinates | |
| Noted that Verify_Only selection in APT now has appropriate warnings. | |
| Noted what is needed to move a MOS program from implementation to scheduling. | |
Proposal Preparation → JWST General Support | ||
| Updated MIRI section to include definition of FASTR1 & SLOWR1 | |
| Proposal Preparation → Methods and Roadmaps | ||
| HCI APT Coronagraphic Sequence Examples |
| All information has been updated to represent APT 2024.5 |
| HCI MIRI Limiting Contrast |
| Added link and reference to published in-flight updates to MIRI coronagraphic performance |
| JWST Imaging |
| Updated Figure 3, JWST imaging sensitivity, to use sensitivities from ETC 4.0. |
| Moving Target Acquisition and Tracking |
| Updated the visit splitting distance |
| JWST Imaging |
| Updated Figure 3, JWST imaging sensitivity, to use sensitivities from ETC 4.0. |
| HCI Inner Working Angle |
| Added table note on effective diameter of 5.2m for NIRCam (due to Lyot stop) |
| JWST Multi-Object Spectroscopy |
| Updated references from SpecViz and MOSViz to JDaviz |
| Moving Target APT Instructions |
| Added a link to documentation describing the visualization of a moving target ephemeris in Aladin. |
| Moving Target Overheads |
| Updated the default slew time |
| Proposing Tools → Exposure Time Calculator | ||
| JWST ETC Point Spread Functions |
| Updated WebbPSF version numbers for ETC 4.0 |
| JWST ETC NIRCam Target Acquisition |
| Updated saturation limits for ETC 4.0 |
| JWST ETC Images and Plots |
| Updated for ETC 4.0—replaced images to show new aperture drawing feature |
| JWST ETC Cosmic Ray Implementation |
| Updated for ETC 4.0 to account for ramps with a single group |
| JWST ETC Batch Expansions |
| Updated for ETC 4.0 to account for the new support for single-group ramps and the NIRCam SW grism time-series mode |
| JWST ETC Aperture Spectral Extraction Strategy |
| Updated for ETC 4.0 to describe support for square apertures and pixel units |
| JWST ETC Saturation |
| Updated for ETC 4.0. Updated NIRISS saturation values, added saturation limit for NIRCam SW grism time series, and updated the full saturation definition to account for ramps with a single group. |
| JWST ETC Scenes and Sources Page Overview |
| Added row for NIRCam SW time-series grism in scene size table |
| JWST ETC Time-Series Modes |
| Updated for ETC 4.0 to add a link for the new NIRCam SW grism time-series mode |
| Pandeia Quickstart |
| Updated examples for ETC 4.0 |
| Pandeia Reports |
| Updated definition of duty cycle and plots for ETC 4.0 |
| Pandeia Batch Mode |
| Updated figures for ETC 4.0 |
| Pandeia Reference Data |
| Updated example meta data for ETC 4.0 |
| Pandeia Configuration Dictionaries |
| Updated figures for ETC 4.0 |
| Pandeia Order of Operations |
| Updated code examples for ETC 4.0 |
| JWST ETC IFU Strategies |
| Added a new section for the "IFU On-Target N-Point Nod" strategy. |
| Proposing Tools → Astronomer's Proposal Tool | ||
| APT Pure Parallel Observations |
| Added point #10 on "Filling out APT forms for pure parallel proposals" |
| APT Submitting Your JWST Proposal |
| Added Figure 1, APT submission interface |
| APT Smart Accounting |
| Updated Figure 5, smart accounting report output |
| Data → Accessing JWST Data | ||
| JWST Time Definitions |
| Updated for ETC 4.0 to provide the correct duty cycle definition |
Data → Science Calibration Pipeline | ||
| Updated build information table for quarterly calibration update model. | |
| Updated for build 11.0 | |
| Updated for build 10.2 | |
| Updated CRDS information to reflect new quarterly calibration update model | |
| Updated to reflect build 10.2 | |
Data → Calibration status | ||
| Updated to report photometric accuracy as of jwst_1296.pmap and link to the imaging photometry technical report. | |
| Updated description about charge migration to note the signal limit used for all filters as of CRDS context jwst_1254.pmap. | |
| Updated accuracy in spectral trace positions for the F115W filter which is reflected in the specwcs reference file as of CRDS context jwst_1252.pmap and accuracy in spectral trace positions for the F150W filter which is reflected in the specwcs reference file as of CRDS context jwst_1263.pmap. | |
| Updated list of recent calibration changes in Table 1 for June and August 2024. | |
| Added links to the time-dependent sensitivity decline | |
| Added a table with detector position and orientation in V2/V3 | |
| Updates about wavelength calibration for slit | |
Data → Known issues with JWST data | ||
| Updated mitigation plan for issue NS-BOTS03 | |
| Created issue NS-BOTS06: Fluxes are too low at the red and blue wavelength extremes of extracted 1-D spectra for M- and H-grating observations | |
| Updated issues NS-BOTS02, NS-BOTS03, NS-BOTS04 | |
| Updated mitigation plan for issues NS-FS07, NS-FS10 | |
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| Updated mitigation plan for issues NS-G05, NS-G08 | |
| Created issue NS-G09: Uncertainties in the combined background images produced in the background step are not propagated into science data. | |
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| Updated mitigation plan for issues NS-MOS04, NS-MOS07, NS-MOS08, NS-MOS09 | |
| Created issue NS-MOS10: Uncertainties in the background spectrum are not accounted for when using the master_background_mos step. | |
| Updated issues NS-MOS01, NS-MOS03, NS-MOS04, NS-MOS05, NS-MOS06, NS-MOS07, NS-MOS08, NS-MOS09 | |
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| Added information on resampling images onto common pixel grid. Updated Wisp information. | |
| Minor updates to the alignment section to improve clarity. Added NC-I07 to the table in order to summarize the issue already described in the page text. | |
| Added issue NC-I06: Point source aperture photometry results may show a filter-dependent discrepancy compared to PSF photometry results when using NIRCam aperture correction reference files in CRDS. | |
| Updated to discuss major updates in the calwebb_ami3 stage deployed in pipeline build 10.2 | |
| Added new section "Electromagnetic interference (EMI) pattern noise" | |
| Updates on wavelength calibration. | |
| Updated to reflect jwst software patch 1.14.1 for build 10.2 (fixing a numpy dependency issue) | |
| Updated to reflect jwst software patch 1.14.1 for build 10.2 (fixing a numpy dependency issue) | |
| Resolved issue NR-WFSS04: WCS keywords in the header of pure parallel WFSS observations (both direct images and grism exposures) taken prior to June 12, 2024, are "off" by of order 0.1 arcsec no matter which SI is prime, and the offset is generally different for different dither positions. | |
| Updated issue NR-WFSS01: the field dependence of the spectral trace shape is now calibrated for both grisms in the F200W filter. | |
| Added issue NR-WFSS04: WCS keywords in the header of pure parallel WFSS observations are "off" by about 0.1 arcsec | |
| NIRCam Scattered Light Artifacts |
| Updated claw/wisp example with higher SNR stack with no galaxy contaminant so they are more clear. |
| Updated information on claws, wisps, and msa short contam with latest findings. Changed claw example picture to one not impacted by wisps so the claw is more clear. | |
| NC-TS02 was fixed in build 10.2. NC-TS01 - added note about running notebook on prior pipeline versions. | |
| Updated to indicate snowball correction is turned on by default | |
| Updated to note that the default source finding algorithm in tweakreg for NIRISS (specified by the "pars-tweakreg" parameter reference file) is IRAFStarFinder as of pipeline build 10.2 and CRDS context jwst_1223.pmap. | |
| Added issue NR-I02: WCS keywords in the header of pure parallel imaging observations are "off" by about 0.1 arcsec | |
| NIRCam Coronagraphy Known Issues |
| For issue NC-CI02, added another workaround to reduce excessive outlier flagging.
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| Added a warning that the most recent WFSS photom reference files are designed to work with pipeline v.1.14.0 or later. Previous reffiles are designed for pipeline versions prior to 1.14.0 Added issue NC-WFSS04: Calibrated flux values in WFSS or grism time series products are too large or too small by a factor of ~10. | |
| Article rewritten for build 10.2, reorganized and added figure about typical snowball corrections. | |
| Updated accuracy in spectral trace positions for the F200W filter which is reflected in the specwcs reference file as of CRDS context jwst_1228.pmap. | |
Articles updated prior to Jan 1, 2024
Articles updated between June 1 and December 31, 2023 are listed at JDox Updates 1 June - 31 December 2023
Articles updated between January 28 and May 31, 2023 are listed at JDox Updates 28 Jan - May 31 2023.
Articles updated prior to January 27 2023 are listed at JDox Updates 12 July - 6 December 2022.