The Australia Telescope . 20 GHz (AT20G) Survey . ... Data Catalogues . ... Observations were carried out using the Australia Telescope Compact Array (ATCA) from 2004-2008. The final AT20G catalogue consists of 5890 sources above a 20 GHz flux density limit of 40 mJy and includes near-simultatneous observations at 4.8 and 8.6 GHz for most sources south of -15 o . A full description of the survey and resulting catalogue is presented in the source catalogue paper: Murphy, T. et al. ...