GALEX Unique Source Catalogs ("GCAT")

GALEX undertook a number of surveys covering large areas of the sky at a variety of depths. However, making use of this large data set can be difficult because the standard GALEX database contains all of the detected sources, which include many duplicate observations of the same sources, as well as numerous spurious low signal-to-noise sources. At the same time, the sky footprint associated with GALEX observations has not been well defined or presented in an easily usable format. Seibert et al. have constructed three catalogs of GALEX unique source measurements; namely the GALEX All-Sky Survey Source Catalog (GASC), the GALEX Medium Imaging Survey Catalog (GMSC), and the Kepler GCAT. The team's intention is that these catalogs will provide the primary reference catalog useful for matching GALEX measurements with other large surveys of the sky at other wavelengths.