Pipeline Calibrations (original) (raw)

2009

Abstract

Abstract. Our strategies for collecting ACS calibration data, and converting it into reference files for use in the calibration pipeline, have been continually evolving since the instrument was installed during Hubble Servicing Mission 3B in March of 2002. We provide an historical overview of basic ACS pipeline calibrations, including the impact that some of the more recent changes have on downstream data processing (e.g. drizzling). This paper emphasizes bias and dark calibrations for the ACS CCDs, and it represents a significant update to previous documentation of this subject (Mutchler et al. 2004). We describe the expected detector degradations that these calibrations are designed to track and correct, and also some unexpected anomalies we’ve encountered and the steps we’ve taken to ameliorate them.

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