An Updated Version of the Unified Radio Catalog: A Multi-Wavelength
  Radio and Optical Catalog of Quasars and Radio Galaxies
  We present an updated version of the Kimball & Ivezic (2008) radio catalog
using updated radio and optical data, and new low-frequency radio data. The
catalog, containing millions of radio sources, was created by consolidating
large-area radio and optical surveys GB6 (6cm), FIRST (20cm), NVSS (20cm),
WENSS (92cm), VLSSr (4m), and SDSS DR9 (optical). The region where all surveys
overlap covers 3269 square degrees in the North Galactic Cap, and contains
>160,000 20-cm sources, with about 12,000 detected in all five radio surveys
and over one-third detected optically. Combining parameters from the sky
surveys allows easy and efficient classification by radio and optical
morphology and radio spectral index. The catalog is available at
http://www.aoc.nrao.edu/~akimball/radiocat.shtml .
