E.7 The Cycle 21 Calibration Plan

The Cycle 21 calibration plan is summarized in WFC3 ISR 2014-07. It was executed from November 2013 through October 2014.

The calibration programs comprising this plan are listed in Table E.8. The proposals and observation dates can be viewed by entering the Proposal ID into the HST Program Information webpage.

The Cycle 21 calibration plan was designed to:

•	continue to maintain and update the standard reference files (biases, darks, linearity, CTE traps)

•	continue to monitor the instrument (throughput, gain, hysteresis, bad/hot pixels, filter transmission, IR blobs, grism calibration, CTE decline, stability of post-flash)

•	improve photometric precision (CTE correction, IR flat fields, dynamic range, IR persistence)

•	improve astrometric precision (spatial scans, DGEO files)

•	enhance UV calibration (flat fields, post-flash and CTE correction)

•	improve our understanding of IR persistence, IR blobs and the CSM, anomalous QE in CCD pixels

The results of these calibration programs will be documented in Instrument Science Reports on the WFC3 website at:

http://www.stsci.edu/hst/wfc3/documents/ISRs/

Table E.8: Cycle 21 Calibration Programs  

Proposal ID	Title
13554	UVIS anneal
13555	UVIS bowtie monitor
13556	UVIS CCD daily monitor A
13557	UVIS CCD daily monitor B
13558	UVIS CCD daily monitor C
13559	UVIS CCD un-flashed monitor
13560	UVIS post-flash monitor
13561	UVIS CCD gain stability
13562	IR dark monitor
13563	IR linearity monitor
13564	IR gain monitor
13565	UVIS CTI monitor (EPER)
13566	UVIS CTE monitor (star cluster)
13567	CTE characterization with post-flashed darks
13568	Characterization of the charge-level dependence of CTE losses
13569	Characterization of UVIS traps with CI
13570	UVIS & IR geometric distortion
13571	High precision astrometry
13572	IR persistence model tests
13573	Trapping mitigation in spatial scan observations of exosolar planets
13574	WFC3 contamination & stability monitor
13575	WFC3 UVIS & IR photometry
13576	IR grisms: cross check sensitivity function of hot and cool stars
13577	UVIS grisms: flux calibration
13578	UVIS grisms: wavelength calibration
13579	IR grisms: flux calibration
13580	IR grisms: wavelength calibration
13581	IR grisms: sky characterization
13582	Calibration of the IR grism wavelength ZPs
13583	UV flats spatial scan
13584	UV flat field validation
13585	CCD anomalous QE pixels
13586	UVIS internal flats
13587	IR internal flats
13588	CSM monitor with earth flats
13624	Monitoring Persistence after scanned grism observations
13625	Characterizing persistence following scanned grism observations
13627	Timing verification for spatial scan observations