A search for Fast Radio Bursts at low frequencies with Murchison Widefield Array high time resolution imaging
S.J. Tingay, C.M. Trott, R.B. Wayth, G. Bernardi, J.D. Bowman, F., Briggs, R.J. Cappallo, A.A. Deshpande, L. Feng, B.M. Gaensler, L.J., Greenhill, P.J. Hancock, B.J. Hazelton, M. Johnston-Hollitt, D.L. Kaplan,, C.J. Lonsdale, S.R. McWhirter, D.A. Mitchell, M.F. Morales

TL;DR
This study conducted a low-frequency search for Fast Radio Bursts using the Murchison Widefield Array, finding no detections but setting limits on event rates and spectral indices, which challenges some models of FRB origins.
Contribution
First low-frequency imaging search for FRBs with MWA, establishing new limits on event rates and spectral indices at these frequencies.
Findings
No FRBs detected above the threshold.
Event rate limit of less than 700 per sky per day.
Spectral index $eta > -1.2$ constrained.
Abstract
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 where the primary target was a field being studied for Epoch of Reionisation detection. We formed images with 2 second time resolution and 1.28~MHz frequency resolution for 10.5 hours of observations, over 400 square degrees of the sky. We de-dispersed the dynamic spectrum in each of 372,100 resolution elements of 22 arcmin, between dispersion measures of 170 and 675~pc~cm. Based on the event rate calculations in Trott, Tingay & Wayth (2013), which assumes a standard candle luminosity of Js, we predict that with this choice of observational parameters, the MWA should detect (,,) FRBs with spectral…
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Taxonomy
TopicsImage and Signal Denoising Methods
