New dark reference files have been released for the following WFC3/IR observing modes: RAPID/Full-Frame, SPARS10/Full-Frame, SPARS25/Full-Frame, SPARS50/Full-Frame, SPARS100/Full-Frame, STEP25/Full-Frame, STEP50/Full-Frame, STEP100/Full-Frame, and STEP200/Full-Frame.
These new files were created from a much larger number of input ramps taken over a longer timespan than the previous darks. The larger number of input ramps significantly improves signal to noise and reduces error values. For most modes, the signal to noise in the new reference files is a factor of 5-8 higher than in the previous reference files. In addition, these new darks incorporate non-linearity correction, and fix an incorrectly set header keyword value (in SCI headers of the previous CDBS darks, bunit was incorrectly set to "counts/s", when it should have been set to "counts").
The new dark reference files have been available in MAST and used in OTFR as of Oct 16 2013 19:31:30 GMT. To apply the new dark reference files to observations retrieved before this date, users can either download the appropriate dark reference file(s) (listed below) and manually reprocess their observations, or simply re-retrieve them from the Archive.
|Observing Mode||Dark Reference File Name|