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We have measured stellar photometry with the Hubble Space Telescope (HST)Wide Field Camera 3 (WFC3) and Advanced Camera for Surveys (ACS) in nearultraviolet (F275W, F336W), optical (F475W, F814W), and near infrared (F110W,F160W) bands for 117 million resolved stars in M31. As part of the PanchromaticHubble Andromeda Treasury (PHAT) survey, we measured photometry withsimultaneous point spread function fitting across all bands and at all sourcepositions after precise astrometric image alignment (<5-10 milliarcsecondaccuracy). In the outer disk, the photometry reaches a completeness-limiteddepth of F475W~28, while in the crowded, high surface brightness bulge, thephotometry reaches F475W~25. We find that simultaneous photometry and optimizedmeasurement parameters significantly increase the detection limit of the lowestresolution filters (WFC3/IR) providing color-magnitude diagrams that are up to2.5 magnitudes deeper when compared with color-magnitude diagrams from WFC3/IRphotometry alone. We present extensive analysis of the data quality includingcomparisons of luminosity functions and repeat measurements, and we useartificial star tests to quantify photometric completeness, uncertainties andbiases. We find that largest sources of systematic error in the photometry aredue to spatial variations in the point spread function models and chargetransfer efficiency corrections. This stellar catalog is the largest everproduced for equidistant sources, and is publicly available for download by thecommunity.

The Panchromatic Hubble Andromeda Treasury X. Ultraviolet to Infrared Photometry of 117 Million Equidistant Stars