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ACS Dark Reference Images
WFC Dark Reference
HRC Dark Reference
SBC Dark Reference
See ACS ISR 2004-07 for details on the production of ACS superbias and superdark reference files.
From launch (March 2002) until October 2004, a WFC and HRC superdark was typically produced for every day of the year. Starting in October 2004, a superdark will be produced every other day. The "best" superdark is typically available for use in the pipeline 2-3 weeks after an observation date. ACS users are advised to retrieve (or re-retrieve) their data via OTFR after the best superdark is available.
Figure: A typical WFC superdark. This image has been smoothed to enhance the subtle features (other than hot pixels). Click to enlarge image.