Murchison Widefield Array rapid-response observations of the short GRB 180805A
G. E. Anderson, P. J. Hancock, A. Rowlinson, M. Sokolowski, A., Williams, J. Tian, J. C. A. Miller-Jones, N. Hurley-Walker, K. W. Bannister,, M. E. Bell, C. W. James, D. L. Kaplan, Tara Murphy, S. J. Tingay, B. W., Meyers, M. Johnston-Hollitt, R. B. Wayth

TL;DR
This study used the Murchison Widefield Array to set upper limits on low-frequency radio emissions from the short gamma-ray burst 180805A, testing models of coherent emission from neutron star mergers with rapid response observations.
Contribution
First rapid-response low-frequency radio observations of a short GRB with stringent flux and fluence limits, demonstrating MWA's unique capability to probe prompt emission models.
Findings
No detection of prompt or persistent radio emission from GRB 180805A.
Set upper limits on fluence and flux density for coherent emission models.
Showed MWA's unique sensitivity and rapid response capability for future SGRB observations.
Abstract
Here we present stringent low-frequency 185MHz limits on coherent radio emission associated with a short gamma-ray burst (SGRB). Our observations of the short GRB 180805A were taken with the upgraded Murchison Widefield Array (MWA) rapid-response system, which triggered within 20s of receiving the transient alert from Swift, corresponding to 83.7s post-burst. The SGRB was observed for 30m, resulting in a 3sigma persistent flux density upper-limit of 40.2mJy/beam. Transient searches were conducted at the Swift position of this GRB on 0.5s, 5s, 30s, and 2m timescales, resulting in 3sigma limits of 570-1830, 270-630, 200-420, and 100-200mJy/beam, respectively. We also performed a dedispersion search for prompt signals at the position of the SGRB with a temporal and spectral resolution of 0.5s and 1.28MHz, resulting in a 6sigma fluence upper-limit range from 570Jyms at DM=3000pc/cm^3…
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