The AT20G catalogue: Version 1 of the AT20G catalogue was made publicly available on the 3rd of November, 2009. A description of the catalogue format can be found here. The survey strategy, observations and results can be found in Murphy, T. et al. 2010, MNRAS, 402, 2403. while a more detailed analysis of the sample is presented in Massardi, M. et al., 2011, MNRAS, 412, 318.
The AT20G Bright Source Sample comprises 320 of the brightest (20 GHz flux above 500 mJy) AT20G sources south of -15 degrees. The AT20G-BSS catalogue is described in detail in Massardi et al., 2008 MNRAS, 384, 775.
Optical properties of AT20G sources: Optical identifications were found by crossmatching the AT20G survey with the SuperCOSMOS database. Using the optical positions, redshifts were found from either the literature, the 6dF Galaxy Survey or additional spectroscopic observations carried out on a range of telescopes including the ANU 2.3m telescope, ESO's New Technology Telescope (NTT) or Gemini-South. The AT20G-optical catalogue is presented in Mahony E.K. et al., 2011, MNRAS, 417, 2651.
AT20G-1FGL (1 year Fermi-LAT catalogue) matches: Crossmatching the AT20G survey with the 1st-year data release of the Fermi-LAT point source catalogue (1FGL, Abdo et al., 2010, ApJS, 188, 405) resulted in 240 identifications, corresponding to 43% of the extragalactic, southern Fermi sources. The AT20G-1FGL catalogue is presented in Mahony E.K. et al., 2010, ApJ, 718, 587.