GLEAM-300 J/other/PASA/42. ivo://CDS.VizieR/J/other/PASA/42.158 doi:10.26093/cds/vizier/ds/eckbfi CDS Duchesne S. Cook J.H. Hurley-Walker N. Thomson A.J.M. Paterson S.,Riseley C.J. McSweeney S.J. Mantovanini S. Heald G. Franzen T.M.O.,Ross K. Seymour N. Wayth R.B. Galvin T.J. 2026-03-20T20:02:59Z 2026-02-19T13:15:33Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys radio-sources galaxies catalogs galaxy-classification-systems We present a wide-field radio survey at 300MHz covering the sky from -90 degrees to +40 degrees in declination using the Murchison Widefield Array (MWA). This 300-MHz survey follows the Galactic and Extragalactic All-sky MWA (GLEAM) survey, and provides an additional comparatively high-frequency data point to existing multi-frequency (72-231MHz) data. With this data release we provide mosaic images and a catalogue of compact source components. We use two-minute snapshot observations covering 2015 to 2016, combining overlapping two-minute snapshot images to provide full-sensitivity mosaic images with a median root-mean-square noise of 9.1^+5.5^_-2.8_mJy/beam and median angular resolution of 128.8"x112.5", with some position-dependent variation. We find a total of 338080 unique Gaussian components across the mosaic images. The survey is the first at 300MHz from the MWA covering the whole Southern Hemisphere. It provides a unique spectral data point that complements the existing GLEAM survey and the ongoing GLEAM-eXtended survey, and points toward results from the upcoming SKA-Low surveys. 2025PASA...42..158D https://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/PASA/42.158 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VIII/100 : GaLactic and Extragalactic All-sky MWA survey VIII/102 : GLEAM II. Galactic plane (Hurley-Walker+, 2019) VIII/105 : The GLEAM 4-Jy (G4Jy) Sample (White+, 2020) VIII/109 : GLEAM III. South Galactic Pole (Franzen+, 2021) VIII/110 : GLEAM-X Data Release 1 (Hurley-Walker+, 2022) VIII/113 : GLEAM-X Data Release 2 (Ross+, 2024) J/other/PASA/38.41 : GLEAM 200MHz local radio luminosity function J/other/PASA/42.137 : GLEAM-X. Galactic plane (Mantovanini+, 2026) https://doi.org/10.25919/z80f-5t62 : catalogue and mosaic images https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/PASA/42.158 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/PASA/42.158 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/PASA/42.158 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/PASA/42.158 https://vizier.iucaa.in/viz-bin/votable?-source=J/other/PASA/42.158 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/PASA/42.158 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/other/PASA/42.158/gleam300 (GLEAM-300 catalogue) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/PASA/42.158/gleam300? https://vizier.iucaa.in/viz-bin/conesearch/J/other/PASA/42.158/gleam300? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/PASA/42.158/gleam300? 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46101-46103 48080 48082-48083 1.9878209500813076e-25 1.9878209500813076e-25 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/PASA/42.158?format=ascii Optical Radio default J/other/PASA/42.158/gleam300 GLEAM-300 catalogue recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Component name following IAU convention, GLEAM-300 JHHMMSS+/-DDMMSS (name) meta.id;meta.main char RAJ2000 Right ascension (J2000) of the component (RAJ2000) deg pos.eq.ra;meta.main indexed e_RAJ2000 Uncertainty on right ascension from fitting the component (err_RAJ2000) deg stat.error;pos.eq.ra double DEJ2000 Declination (J2000) of the component (DEJ2000) deg pos.eq.dec;meta.main indexed e_DEJ2000 Uncertainty on declination from fitting the component (err_DEJ2000) deg stat.error;pos.eq.dec double localrms Local estimate of the root- mean-square noise (local_rms) Jy/beam instr.det.noise float background Local estimate of the background (background) Jy/beam instr.background float Fpeak Peak flux density at 300MHz of the component (peak_flux) Jy/beam phot.flux.density;em.radio.200-400MHz double e_Fpeak Uncertainty in the peak flux density (err_peak_flux) Jy/beam stat.error double Fint Integrated flux density at 300MHz of the component (int_flux) Jy phot.flux.density;em.radio.200-400MHz double e_Fint Uncertainty in the integrated flux density of the component (err_int_flux) Jy stat.error double amaj FWHM of the major axis of the component (a) arcsec phys.angSize float e_amaj Uncertainty in the FWHM of the major axis (err_a) arcsec stat.error float bmin FWHM of the minor axis of the component (b) arcsec phys.angSize float e_bmin Uncertainty in the FWHM of the minor axis (err_b) arcsec stat.error float PA [] Position angle of the component (pa) deg pos.posAng float e_PA Uncertainty in the position angle (err_pa) deg stat.error float bamaj Local major axis of the beam (bmaj) arcsec phys.angSize;src float bbmin Local minor axis of the beam (bmin) arcsec phys.angSize;src float bPA Local position angle of the beam (bpa) deg pos.posAng;instr.beam float Flags Aegean fitting flags (flags) meta.code.error int FluxScaleErr Flux density scale uncertainty (flux_scale_err) stat.error float