The Cycle 18 calibration plan is summarized in WFC3 ISR 2011-14. It was executed from October 2010 to September 2011. The calibration programs comprising this plan are listed in
Table E.5. The proposals and observation dates can be viewed by entering the Proposal ID into the
HST Program Information Web page. The Cycle 18 plan provides less frequent monitoring of characteristics that were demonstrated to be stable during Cycle 17. It places increased emphasis on characterizing IR persistence, measuring UVIS and IR flat fields, calibrating the IR grism, monitoring CTE on the UVIS detector, and quantifying the ability to do high contrast imaging on both detectors. It tests CTE mitigation procedures and the performance of spatial scans for high S/N IR observations.
