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The GaLactic and Extragalactic All-sky MWA survey (GLEAM) is a radiocontinuum survey at 72-231 MHz of the whole sky south of declination +30 deg,carried out with the Murchison Widefield Array (MWA). In this paper, we derivesource counts from the GLEAM data at 200, 154, 118 and 88 MHz, to a fluxdensity limit of 50, 80, 120 and 290 mJy respectively, correcting forionospheric smearing, incompleteness and source blending. These counts are moreaccurate than other counts in the literature at similar frequencies as a resultof the large area of sky covered and this survey's sensitivity to extendedemission missed by other surveys. At S_154MHz > 0.5 Jy, there is no evidence offlattening in the average spectral index (alpha approx. -0.8 where Sproportional to nu^alpha) towards the lower frequencies. We demonstrate thatthe SKA Design Study (SKADS) model by Wilman et al. (2008) significantlyunderpredicts the observed 154 MHz GLEAM counts, particularly at the brightend. Using deeper LOFAR counts and the SKADS model, we find that sidelobeconfusion dominates the thermal noise and classical confusion at nu >~ 100 MHzdue to both the limited CLEANing depth and undeconvolved sources outside thefield-of-view. We show that we can approach the theoretical noise limit using amore efficient and automated CLEAN algorithm.

Source counts and confusion at 72-231 MHz in the MWA GLEAM survey