First Data Release of the All-sky NOAO Source Catalog

Most of the sky has been imaged with NOAO's telescopes from both hemispheres. While the large majority of these data were obtained for PI-led projects and almost all of the images are publicly available, only a small fraction have been released to the community via well-calibrated and easily accessible catalogs. We are remedying this by creating a catalog of sources from most of the public data taken on the CTIO-4 m+DECam and the KPNO-4 m+Mosaic3. This catalog, called the NOAO Source Catalog (NSC), contains over 2.9 billion unique objects, 34 billion individual source measurements, covers approximate to 30000 square degrees of the sky, has depths of approximate to 23rd magnitude in most broadband filters with approximate to 1%-2% photometric precision, and astrometric accuracy of approximate to 7 mas. In addition, approximate to 2 billion objects and approximate to 21000 square degrees of sky have photometry in three or more bands. The NSC will be useful for exploring stellar streams, dwarf satellite galaxies, QSOs, high-proper motion stars, variable stars, and other transients. The NSC catalog is publicly available via the NOAO Data Lab service.