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We present the results of a pilot study search for Fast Radio Bursts (FRBs)using the Murchison Widefield Array (MWA) at low frequencies (139 - 170 MHz).We utilised MWA data obtained in a routine imaging mode from observations wherethe primary target was a field being studied for Epoch of Reionisationdetection. We formed images with 2 second time resolution and 1.28~MHzfrequency resolution for 10.5 hours of observations, over 400 square degrees ofthe sky. We de-dispersed the dynamic spectrum in each of 372,100 resolutionelements of 2$\times$2 arcmin$^{2}$, between dispersion measures of 170 and675~pc~cm$^{-3}$. Based on the event rate calculations in Trott, Tingay & Wayth(2013), which assumes a standard candle luminosity of $8\times10^{37}$Js$^{-1}$, we predict that with this choice of observational parameters, theMWA should detect ($\sim10$,$\sim2$,$\sim0$) FRBs with spectral indicescorresponding to ($-$2, $-$1, 0), based on a 7$\sigma$ detection threshold. Wefind no FRB candidates above this threshold from our search, placing an eventrate limit of $<700$ above 700 Jy.ms per day per sky and providing evidenceagainst spectral indices $\alpha<-1.2$ ($S\propto\nu^{\alpha}$). We compare ourevent rate and spectral index limits with others from the literature. Webriefly discuss these limits in light of recent suggestions that supergiantpulses from young neutron stars could explain FRBs. We find that suchsupergiant pulses would have to have much flatter spectra between 150 and 1400MHz than have been observed from Crab giant pulses to be consistent with theFRB spectral index limit we derive.

A search for Fast Radio Bursts at low frequencies with Murchison Widefield Array high time resolution imaging