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JWST's NIRCam IPR Imaging Engineering template, available in the Astronomer’s Proposal Tool (APT), is used for calibration observations for the NIRCam instrument.

Introduction

These parameters are required to obtain observations with the IPR wedges while flashing the LED lamps. The data will be analyzed to measure the wavefront error internal to NIRCam, and to track that WFE over time. Calibration measurements will be taken based on the combination of Module and LED Lamp.          

The NIRCam IPR Imaging template consists of the following parameters:

FieldDetailsValuesNotes
General Information
Observation Numberassign observation number

number


Observation Label provide observation labeltextoptional
Observations Commentsprovide observation commentstextoptional
Target Nameselect Target Namechoose from listfrom Target List
Special Requirementsspecify special requirementschoose from listif needed
Template Specific Information

Module

select Module

choose from list


LED Lamp

select LED Lamp

choose from list


General Information

 The following parameters are generic to all templates, and are not discussed in this article: Observation Number,  Observation Label, Observations Comments, Target Name,  and Special Requirements. 

Target Name

Select the TARGET NAME  from the list of targets previously entered (see list of targets).

Module 

MODULE [MODULE] = A, B, ALL, ASHORT, ALONG, BSHORT, BLONG

This parameter specifies the module that is to be used.  The modules are defined in Table 1.

 Table 1. IPR Modules

Module

Definition

LED Lamp

No. of Exposures

A

All short and long wavelength detectors in Module A

REDUNDANT

9

B

All short and long wavelength detectors in Module B

BOTH

15

B

All short and long wavelength detectors in Module B

PRIME

9

ALL

All detectors in Module A and then all detectors in Module B

BOTH

24

ALL

All detectors in Module A and then all detectors in Module B

REDUNDANT

15

ASHORT

All 4 SCAs in the short wavelength detector for Module A

REDUNDANT

6

ALONG

The long wavelength detector in Module A

REDUNDANT

3

BSHORT

All 4 SCAs in the short wavelength detector for Module B

BOTH

12

BSHORT

All 4 SCAs in the short wavelength detector for Module B

PRIME

6

BSHORT

All 4 SCAs in the short wavelength detector for Module B

REDUNDANT

6

BLONG

The long wavelength detector in Module B

PRIME

3

Note for developers: The No. of exposures is the number of exposures that will be taken by the OSS scripts when executing the IPR imaging template, which have an exposure time of approximately 42 seconds each, with 1 additional second of overhead included. The timing of this template is all reported as instrument overheads in APT.

LED Lamp 

LED LAMP [LEDLAMP] = PRIME, REDUNDANT, BOTH

This parameter specifies the LED lamp that is to be used.

Change log

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General Notes

The documents I used in preparing this chapter are the Preliminary Definition of Observing Templates for JWST Engineering Activities (Beck, Aug. 2008, Final) , the Eng/Cal templates powerpoint presentation of Balzano (May 2008), and the NIRCam OCD (Sahu, V4, Jan 2008).  Updates from the December 2, 2008 meeting are also included (new vocabulary, Readout Region à Subarray, Detector à Module, clarify need for filter pairs).

Change Log

Version 2 (April 17, 2019)

  1. Editorial change (moved change log to main article).


Version 1 (March 30, 2017)

This is the converted Word File from Chapter 29.

Keywords

JWST NIRCam IPR Imaging Template

JWST NIRCam IPR Imaging template parameters

Format definitions

 Boldface italics type indicates the name of an APT parameter or a value for a parameter.

 Brown text indicates notes for the developers.

 Green text indicates the name of the parameter used by Commanding.

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