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We present a search for transient and variable radio sources at 154 MHz withthe Murchison Widefield Array 32-tile prototype. Fifty-one images were obtainedthat cover a field of view of 1430 deg^2 centred on Hydra A. The observationswere obtained over three days in 2010 March and three days in 2011 April andMay. The mean cadence of the observations was 26 minutes and there wasadditional temporal information on day and year timescales. We explore thevariability of a sample of 105 low frequency radio sources within the field.Four bright (S > 6 Jy) candidate variable radio sources were identified thatdisplayed low levels of short timescale variability (26 minutes). We concludethat this variability is likely caused by simplifications in the calibrationstrategy or ionospheric effects. On the timescale of one year we find twosources that show significant variability. We attribute this variability toeither refractive scintillation or intrinsic variability. No radio transientswere identified and we place an upper limit on the surface density of sourcesrho < 7.5 x 10^-5 deg^-2 with flux densities > 5.5 Jy, and characteristictimescales of both 26 minutes and one year.

A survey for transients and variables with the Murchison Widefield Array 32-tile prototype at 154 MHz