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August 2022: Drizzling Multi-Epoch Datasets

Prior to combining with AstroDrizzle, multi-epoch observations with ACS/WFC, WFC3/UVIS, or ACS/SBC should be corrected for changes in the detector sensitivities ~0.1-0.2% per year.  A Jupyter Notebook shows how to ‘equalize’ the count rates in WFC3/UVIS images acquired several years apart to create drizzled data products for a selected reference epoch. The photometry keywords in the DRC image header may then be used to compute the zeropoint corrections.

February 2021: Updated DrizzlePac Handbook, now available in HDox

January 2019: New DrizzlePac notebook tutorials released. See WFC3 STAN, Issue 28 for details.