2018AJ....156..131N

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 ≃30000 square degrees of the sky, has depths of ≃23rd magnitude in most broadband filters with ≃1%-2% photometric precision, and astrometric accuracy of ≃7 mas. In addition, ≃2 billion objects and ≃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.