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James Webb Space Telescope User Documentation

 

 

JWST's NIRISS Internal Flat template, available in the Astronomer’s Proposal Tool (APT), is used for calibration observations for the NIRISS instrument.  

Introduction

These parameters are used to define each lamp exposure in an observation. Note that this type of observation cannot be obtained as a parallel to normal science observations, but can be in parallel with slews.

The NIRISS Internal Flat template consists of the following parameters:

FieldDetailsValues Notes
General Information   
Observation Numberassign observation number

number 


Observation Label provide observation labeltextoptional
Observations Comments provide observation commentstextoptional
 Mosaic Propertiesspecify mosaic parametersnumberif needed
Special Requirementsspecify special requirementschoose from listif needed
Template Specific Information   

Target Name

select target name

choose from list


Pointing Typeselect pointing typePARALLEL, PRIME
Filterselect filter namechoose from list 
Readout Patternselect readout patternNIS, NISRAPID
Number of Groups/Integrationspecify number of groups per integrationnumber 
Number of Integrations/Exposurespecify number of integrations per exposurenumber
Lamp Nameselect lamp namechoose from list
Lamp Powerselect lamp power level 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, Mosaic Properties, and Special Requirements.

Target Name

Select the TARGET NAME [TBD] from the list of targets previously entered; see list of targets.  (warning)If POINTING TYPE = PARALLEL, TARGET NAME = NONE. If POINTING TYPE = PRIME, NONE is not available.

Pointing Type

POINTING TYPE = PARALLEL (default), PRIME

Note for developers: This field is not saved directly into the database.

If PRIME, make TARGET NAME required, make the default “None Selected,” and remove the NONE option (so the user is prompted to select a target). Give an error if any PARALLEL special requirement is present.

If PARALLEL, set TARGET NAME = NONE (not changeable), and add a PARALLEL SLEW ONLY special requirement. Give an error if the PARALLEL SLEW ONLY special requirement is not present.

Exposure Specifications

For each exposure to be executed, specify the FILTER, READOUT PATTERN, NUMBER OF GROUPS/INTEGRATION, NUMBER OF INTEGRATIONS/EXPOSURE, LAMP NAME, and LAMP POWER.

Filter

FILTER [FILTER] = GR700XD, F090W, F115W, F140M, F150W, F158M, F200W, F277W, F356W, F380M, F430M, F444W, F480M

This parameter specifies the filter to be used for the exposure.

Note for developers: Even though GR700XD is a grism, it will be stored in the filter table.

Readout Pattern

READOUT PATTERN [READOUT PATTERN] = NIS, NISRAPID

This field specifies the readout pattern to be used to obtain the science data. NIS is used for longer flat exposures and NISRAPID is used for shorter flat exposures.

Number of Groups/Integration

NUMBER OF GROUPS/INTEGRATION [NGROUPS] specifies the number of groups in integration.  (warning)For readout pattern NIS, the range is 1-45, while for NISRAPID, the range is 1-64.

Number of Integrations/Exposure

NUMBER OF INTEGRATIONS/EXPOSURE [NINTS] field specifies the number of times the integration is repeated. (warning)The range is 1-90. 

Lamp Name

LAMP NAME [LAMP] = FLAT1, FLAT2, LINE1, LINE2

This field specifies the lamp to be used during the exposure.

Lamp Power

LAMP POWER [POWER] = OFF, LEVEL1, LEVEL2, LEVEL3, LEVEL4, LEVEL5, LEVEL6, LEVEL7

This field specifies the illumination level for the chosen lamp.

Change log

 Click here to expand...

The initial version of this chapter was provided by Lily Liu. 


Version 4 (April 18, 2019)

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


Version 3 (July 23, 2018)

  1. PR 79707 -  Added Pointing Type section, updated Target Name section


Version 2 (September 18, 2017)

  1. PR 87895 - updated Exposure field labels to Groups/Integration and Integrations/Exposure


Version 1 (October 27, 2016)

This is the converted Word file from Chapter 49.

Keywords

JWST NIRISS Internal Flat Template

JWST NIRISS Internal Flat template parameters

Format definitions

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

(warning)Red text indicates restrictions on a parameter.

Brown text indicates notes for the developers.

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

On this page

JWST Proposal Parameters

Change log

Change log

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