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ACS Bias Reference Images
See ACS ISR 2004-07 for details on the production of ACS superbias and superdark reference files.
Since launch (March 2002), a WFC and HRC superbias has typically been produced for every week or biweek. The "best" superbias 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 superbias is available.
Figure: A typical WFC superbias. Click to enlarge image.