A simultaneous search for prompt radio emission associated with the short GRB 170112A using the all-sky imaging capability of the OVRO-LWA
Marin M. Anderson, Gregg Hallinan, Michael W. Eastwood, Ryan M., Monroe, Harish K. Vedantham, Stephen Bourke, Lincoln J. Greenhill, Jonathon, Kocz, T. Joseph W. Lazio, Danny C. Price, Frank K. Schinzel, Yuankun Wang,, David P. Woody

TL;DR
This study used the OVRO-LWA to perform the most sensitive low-frequency radio search for prompt emission from short GRBs, finding no signals but setting stringent limits on models predicting such emission.
Contribution
First to utilize all-sky imaging at sub-100 MHz frequencies for prompt GRB radio counterpart searches, establishing new upper limits and demonstrating the method's potential.
Findings
No transient radio emission detected from GRB 170112A.
Set a flux density limit of 650 mJy across 27-84 MHz.
Constrained models predicting prompt low-frequency radio emission.
Abstract
We have conducted the most sensitive low frequency (below 100 MHz) search to date for prompt, low-frequency radio emission associated with short-duration gamma-ray bursts (GRBs), using the Owens Valley Radio Observatory Long Wavelength Array (OVRO-LWA). The OVRO-LWA's nearly full-hemisphere field-of-view (, square degrees) allows us to search for low-frequency (sub- MHz) counterparts for a large sample of the subset of GRB events for which prompt radio emission has been predicted. Following the detection of short GRB 170112A by Swift, we used all-sky OVRO-LWA images spanning one hour prior to and two hours following the GRB event to search for a transient source coincident with the position of GRB 170112A. We detect no transient source, with our most constraining flux density limit of for frequencies spanning . We…
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