Is the magnitude system in the NOAO Source Catalog Vega- or AB-based?

Question

Thanks!

Answer 1

The NSC photometric zero-points for g, r, i, z, and Y are based on the Pan-STARRS1 system which uses an AB magnitude system.  The u-band zero-points are based on SDSS which also uses an AB system.  The VR zero-points are based on the Gaia DR1 G magnitude which uses a nominal Vega system.