The Hubble Space Telescope Andromeda Treasury Survey. I. A public Star Catalog and Atlas based on the ACS/WFC data

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As a legacy of the Hubble Space Telescope, a multi-cycle public survey has recently been approved and began to scan an area of approximately 0.5 degrees x 1.5 degrees in one quadrant of M31, using two cameras and several filters. The purpose of this work is to immediately release to the community a catalog of the sources imaged by ACS/WFC. The list will be updated on an almost real-time basis, as new data arrive, and the process will continue for the next two years, until the survey is completed. Each update will contain a chunk of 1/46 of the entire ACS/WFC survey, by means of astrometrized stacked images, and a catalog providing: positions, magnitudes, and several quality parameters.