This page provides information on the reference files used by the JWST pipeline to process NIRCam data. The information is presented by pipeline stages. Details on the pipeline flow and steps, files format and their usage are provided in the specified links.
The JWST NIRCam instrument offers 5 science observing modes that are automatically processed by the JWST pipeline: imaging, coronagraphic imaging, wide field slitless spectroscopy, time series imaging and grism time series. The following sections provide information on the NIRCam-specific reference files used by the pipeline, organised according to the different pipeline stages. In all cases xxxx replaces the version number of the file.
CALWEBB_DETECTOR1 reference files
This pipeline stage process the LVL1 up-the-ramp raw files and returns the level 2a files in units of (counts/sec). To achieve that several the diverse steps in the correspondent NIR pipeline flow use the following reference files:
Table 1. NIRCam reference files used by the JWST pipeline module calwebb_detector1.
This pipeline branch is intended for use with dark exposures. It applies all of the same detector-level correction steps as CALWEBB_Slopes and uses the same refrence files, but stops just before the application of the dark subtraction step.
CALWEBB_IMAGE2 reference files
In this pipeline stage individual exposures from the imaging modes are processed from counts/sec to absolute flux units. Details on the pipeline steps flow are given here.
Table 2. NIRCam reference files used by the JWST pipeline module calwebb_image2.
CALWEBB_SPEC2 reference files
This pipeline stage process Individual exposures from the spectroscopic modes from counts/sec to absolute flux and wavelength units. Nominally, this stage works on individual exposures obtained for the NIRCam wide field slitless grism observations, but the steps are not yet implemented.
Table 3. NIRCam reference files used by the JWST pipeline module calwebb_spec2.
CALWEBB_IMAGE3 reference files
Multiple exposures from the direct imaging modes (e.g., dither pattern or mosaic) are combined into a single rectified (distortion corrected) image. Details on the pipeline steps flow are given in this page.
Table 4. NIRCam reference files used by the JWST pipeline module calwebb_image3.
Multiple individual spectroscopic exposures (i.e. dither patters or mosaics) are combined into a single rectified cube and/or extracted spectrum.
Table 5. NIRCam reference files used by the JWST pipeline module calwebb_spec3.
This pipeline stage processes and combines multiple coronagraphic exposures.
Table 6. NIRCam reference files used by the JWST pipeline module calwebb_coron3.