GLEAM SGP data release

The South Galactic Pole (SGP) data release from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey combines both years of GLEAM observations at 72-231 MHz conducted with Phase I of the Murchison Widefield Array (MWA). It covers an area of 5,113 deg2 centred on the SGP at 20h40m < RA < 05h04m and -48° < Dec < -2º. At 216 MHz, the typical rms noise is ~5 mJy/beam and the angular resolution ~2 arcmin. The source catalogue contains a total of 108,851 components above 5 sigma, of which 77 per cent 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.