NIRISS Imaging Template Parameters
JWST's NIRISS imaging template, available in the Astronomer’s Proposal Tool (APT), has parameters for specifying and scheduling observations.
Purple text indicates the parameter is Limited Access.
Boldface italics type indicates the name of an APT parameter or a value for a parameter.
text indicates restrictions on a parameter. Red
Black text indicates an important note.
Brown text indicates notes for the developers.
Green text indicates the name of the parameter used by Commanding.
Items in brackets - <value> - are required values.
Items in square brackets - [<value>] - are optional.
The NIRISS Imaging template is used for the direct imaging mode of NIRISS, and this article describes allowed values for all parameters. Advice on how to choose values which optimize your science can be found in the NIRISS Imaging APT Template article.
NIRISS Imaging is recommended only as a coordinated parallel or pure parallel observation. For prime observations, NIRCam is recommended at near-IR wavelengths owing to its wider field of view and superior PSF sampling at short wavelengths.
The NIRISS Imaging template consists of the following parameters:
|assign observation number|
|Observation Label||provide observation label||text||optional|
|Observation Comments||provide observation comments||text||optional|
|select Target Name||choose from list||from Target List|
|specify ETC Workbook Calculation ID||number||for science exposures (optional) and target acquisition exposures|
|specify mosaic parameters||number||if needed|
|specify special requirements||choose from list||if needed|
|Template Specific Information|
|select Filter name|
choose from list
|select Readout Pattern|
choose from list
specify Number of Groups per integration
specify Number of Integrations per exposure
Exposures are grouped by filter. For each set of exposures, specify the FILTER, READOUT PATTERN, NUMBER OF GROUPS/INTEGRATION, and the NUMBER OF INTEGRATIONS/EXPOSURE
FILTER [FILTER] = F090W, F115W, F140M, F150W, F158M, F200W, F277W, F356W, F380M, F430M, F444W, F480M
Select the name of each filter to be used to obtain the data. For the filter bandpasses, see NIRISS Filters.
READOUT PATTERN [READOUT PATTERN] = NIS, NISRAPID
This field specifies the readout pattern to be used to obtain the data.
Number of Groups/Integration
NUMBER OF GROUPS/INTEGRATION [NGROUPS] specifies the number of groups in an integration. If READOUT PATTERN = NIS, the range is 1-200, while for NISRAPID the range is 1-30.
Number of Integrations/Exposure
NUMBER OF INTEGRATIONS/EXPOSURE [NINTS] field specifies the number of times the integration is repeated. The range is 1-10.
The initial version of this chapter was provided by Lily Liu.
Version 6 (April 18, 2019)
- Editorial change (moved change log to main article).
Version 5 (August 10, 2018)
- PR 90964 - Updated Introduction; removed Subarray section
Version 4 (September 18, 2017)
- PR 87895 - updated Exposure field labels to Groups/Integration and Integrations/Exposure
Version 3 (September 12, 2016)
PR 85567 - added warning in Introduction about only using this template as a coordinated parallel
Version 2 (September 1, 2016)
PR 85546 - removed subarrays SUB64, SUB128, SUB256
Version 1 (March 8, 2016)
This is the converted Word File from Chapter 40.