| 2023-09-21 |
jwst_1132.pmap |
operational |
Affected data MIRI, MRS modes, gain ref files. These updated MIRI MRS gain files were generated at the conclusion of a study of the gain in the MIRI detectors, demonstrating that the values were lower than the value of 5.5 measured on the ground. The gain values also exhibit a wavelength dependence that is not reflected by the constant number currently in use. These files contain the proper gain value for each combination of MRS Detector and Sub-band. These files also include a new ERROR slice, which while currently not used in the pipeline, may be in the future. |
| 2023-09-15 |
jwst_1130.pmap |
archived |
Affected data - MIRI, imaging, coronagraphic, and LRS modes, apcorr, photom, and gain reference files. There is a new MIRI aperture correction file for the Imager and the new set of photom files for the Imaging and Coronagraphic modes that cover a range of USEAFTER dates in order to include the time dependent sensitivity loss in the MIRI Imager detector. These files have been updated based on observations of multiple stars with well predicted total fluxes. These updated flux calibration factors reflect basing the flux calibration of many calibration stars, improved aperture corrections, and many other post-Commissioning improvements. These files cover all the imaging filters and coronagraph filters. These updated MIRI gain files were generated at the conclusion of a study of the gain in the MIRI detectors, demonstrating that the values were lower than the value of 5.5 measured on the ground. The gain values also exhibit a wavelength dependence that is not reflected by the constant number currently in use. The previous files delivered cover only the MIRI Imager Filters. These files contain the proper gain value for each coronagraphic filter, the LRS P750L filter, and the F2550WR, OPAQUE, and FND filters. These files also include a new ERROR slice, which while currently not used in the pipeline, may be in the future.
Reprocessing info - All MIRI imaging, coronagraphic, and LRS data should be reprocessed. |
| 2023-09-14 |
jwst_1126.pmap |
archived |
Modes affected - NIRCam imaging
These NIRCam photom reference files contain an improved flux calibration for all imaging mode filter combinations compared to the previous reference files. Calibrations were calculated using data spanning 8 months of cycle 1. Uncertainties in the flux calibration are now less than 1 percent for most filter/detector combinations. All other uncertainties are less than 2 percent with the exception of F430M and F460M in the A module, at 3.5 and 2.1 percent, and F460M in the B module, at 4.6 percent. |
| 2023-09-13 |
jwst_1125.pmap |
archived |
jwst_1124.pmap - This delivery makes a minor update to a variety of MIRI MRS flat, photom and distortion reference files. The Channel 4B distortion solution has been updated to fix an 8 percent vertical scale error revealed by observations of Uranus. This scale issue is relevant to all MRS observations, but would be most noticeable for observations of extended sources with well-defined limbs. This delivery also updates the pixel flats for all twelve MRS bands. In channels 1A-3C the update only affects the estimated uncertainty array of the flatfield, while channels 4A-4C make minor adjustments to the flatfield values based on a revised analysis, and the new 4B distortion solution. New photometric calibration vectors are also provided for channels 4A-4C based on these updated flatfields. While these new reference files are recommended for all users, the overall calibration difference is minor and for many users will be insignificant.
jwst_1125.pmap - NIRCam, Affected modes - All NIRCam shortwave imaging data are affected. Reference file - flat. These new NIRCam flat fields correct residual filter-dependent gradients in shortwave imaging data. The corrections are larger-scale and impact pixel values by about one percent. |