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Using the Murchison Widefield Array (MWA), the low-frequency Square KilometreArray (SKA1 LOW) precursor located in Western Australia, we have completed theGaLactic and Extragalactic All-sky MWA (GLEAM) survey, and present theresulting extragalactic catalogue, utilising the first year of observations.The catalogue covers 24,831 square degrees, over declinations south of$+30^\circ$ and Galactic latitudes outside $10^\circ$ of the Galactic plane,excluding some areas such as the Magellanic Clouds. It contains 307,455 radiosources with 20 separate flux density measurements across 72--231MHz, selectedfrom a time- and frequency- integrated image centred at 200MHz, with aresolution of $\approx 2$'. Over the catalogued region, we estimate that thecatalogue is 90% complete at 170mJy, and 50% complete at 55mJy, and large areasare complete at even lower flux density levels. Its reliability is 99.97% abovethe detection threshold of $5\sigma$, which itself is typically 50mJy. Theseobservations constitute the widest fractional bandwidth and largest sky areasurvey at radio frequencies to date, and calibrate the low frequency fluxdensity scale of the southern sky to better than 10%. This paper presentsdetails of the flagging, imaging, mosaicking, and sourceextraction/characterisation, as well as estimates of the completeness andreliability. All source measurements and images are available online(http://www.mwatelescope.org/science/gleam-survey). This is the first in aseries of publications describing the GLEAM survey results.

GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue