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Hubble Space Telescope
[10/21/2013] New full-frame IR dark reference files released

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 SPARS200/Full-frame dark reference file has been available in MAST and used in OTFR as of May 16 2013 15:55:19 GMT. All of the other 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 ModeDark Reference File Name
RAPID/Full-Frame xag19292i_drk.fits
SPARS10/Full-Frame xag19294i_drk.fits
SPARS25/Full-Frame xag19295i_drk.fits
SPARS50/Full-Frame xag19296i_drk.fits
SPARS100/Full-Frame xag19293i_drk.fits
SPARS200/Full-Frame x5g1509ki_drk.fits
STEP25/Full-Frame xag19299i_drk.fits
STEP50/Full-Frame xag1929ai_drk.fits
STEP100/Full-Frame xag19297i_drk.fits
STEP200/Full-Frame xag19298i_drk.fits