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WFC3/UVIS TV3 Post-flash Results

Given recent interest in potentially reviving the WFC3 post-flash capability, we have investigated the state of the ground system and have analyzed the post-flash images acquired during ground testing. Six images were taken with the flight detector on side 2 of the instrument. The post-flash illumination pattern is found to exhibit smooth, largescale gradients of about +/-20% across the full field of view; however, those gradients were quite repeatable. Post-flash image ratios are flat to ~1%, with global offsets in the absolute flux level of 5-10%. The one post-flash image taken with the CCDs fully cooled had a higher flux (~80 e-/s) than the other images taken with the CCD only partially cooled (~60 e-/s). Assuming the former flux for on-orbit post-flash images, low post-flash levels of 10-20e- will be attainable with 0.1-0.3 sec post-flash durations at medium current. Given that 0.1 sec is the minimum allowable post-flash duration, should the onorbit flux level be higher, it will be necessary to switch to the low current setting.