Reference File

The msaflagopen correction step uses a MSAOPER reference file.

CRDS Selection Criteria

NIRSPEC:USEAFTER

Msaoper reference files are selected on the basis of USEAFTER date only. They are valid for NIRSpec only.

MSAOPER Reference File Format

The MSAOPER reference files are json files.

The fields are:

title:

Short description of the reference file

reftype:

Should be “MSAOPER”

pedigree:

Should be one of “DUMMY”, “GROUND” or “INFLIGHT”

author:

Creator of the file

instrument:

JWST Instrument, should be “NIRSPEC”

exp_type:

EXP_TYPEs this file should be used with, should be “NRS_IFU|NRS_MSASPEC”

telescope:

Should be “JWST”

useafter:

Exposure datetime after which this file is applicable

descrip:

Description of reference file

msaoper:

Q:Quadrant, should be an integer 1-4 x:x location of shutter (integer, 1-indexed) y:y location of shutter (integer, 1-indexed) state:state of shutter, should be “closed” or “open” TA state:TA state of shutter, should be “closed” or “open” Internal state:Internal state of shutter, should be “closed”, “normal” or “open” Vignetted:Is the shutter vignetted? Should be “yes” or “no”

history:

Description of the history relevant to this file, might point to documentation