Galactic And Extragalactic All-Sky Murchison Widefield Array (Gleam) Survey Iii: South Galactic Pole Data Release

We present the South Galactic Pole (SGP) data release from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. These data combine both years of GLEAM observations at 72-231 MHz conducted with the Murchison Widefield Array (MWA) and cover an area of 5 113deg(2) centred on the SGP at 20(h)40(m) < RA < 05(h)04(m) and -48 degrees < Dec < -2 degrees. At 216 MHz, the typical rms noise is approximate to 5 mJy beam(-1) and the angular resolution approximate to 2 arcmin. The source catalogue contains a total of 108 851 components above 5 sigma, of which 77% have measured spectral indices between 72 and 231 MHz. Improvements to the data reduction in this release include the use of the GLEAM Extragalactic catalogue as a sky model to calibrate the data, a more efficient and automated algorithm to deconvolve the snapshot images, and a more accurate primary beam model to correct the flux scale. This data release enables more sensitive large-scale studies of extragalactic source populations as well as spectral variability studies on a one-year timescale.