New Photometric Calibration of the Wide Field Camera 3 Detectors

We present a new photometric calibration of the WFC3-UVIS and WFC3-IR detectors based on observations collected from 2009 to 2020 for four white dwarfs, namely GRW+70~5824, GD~153, GD~71, G191B2B, G-type star, P330E. These calibrations include recent updates Hubble Space Telescope primary standard dwarf models reference flux Vega. Time-dependent inverse sensitivities two chips, UVIS1 UVIS2, were calculated all 42 full-frame filters, after accounting temporal changes in observed count rates with respect epoch 2009. also derived encircled energy values few filters improved sensitivity ratios chips by correcting time. Updated 20 quad 15 WF3-IR using standards Vega and, case IR detector, flat fields. However, these do not account any The provides internal precision better than 0.5% wide-, medium-, narrow-band 5% 1% filters. As October 15, 2020, an updated set keywords are populated WFC3 image headers.