Rapid-response radio observations of short GRB 181123B with the Australia Telescope Compact Array
G. E. Anderson, M. E. Bell, J. Stevens, M. D. Aksulu, J. C. A., Miller-Jones, A. J. van der Horst, R. A. M .J. Wijers, A. Rowlinson, A., Bahramian, P. J. Hancock, J.-P. Macquart, S. D. Ryder, R. M. Plotkin

TL;DR
This paper demonstrates the successful rapid-response radio observation of short GRB 181123B using ATCA, highlighting the importance of quick follow-up in constraining GRB afterglow properties and informing future gravitational wave counterpart searches.
Contribution
First successful rapid-response radio observation of a short GRB with ATCA, showing how early data improve afterglow modeling and constraints on physical parameters.
Findings
No radio afterglow detected during observations.
Inclusion of radio data tightened constraints on electron energy fraction.
Predicted radio peak around 10 days post-burst.
Abstract
We introduce the Australia Telescope Compact Array (ATCA) rapid-response mode by presenting the first successful trigger on the short-duration gamma-ray burst (GRB) 181123B. Early-time radio observations of short GRBs may provide vital insights into the radio afterglow properties of Advanced LIGO- and Virgo-detected gravitational wave events, which will in turn inform follow-up strategies to search for counterparts within their large positional uncertainties. The ATCA was on target within 12.6 hr post-burst, when the source had risen above the horizon. While no radio afterglow was detected during the 8.3 hr observation, we obtained force-fitted flux densities of and Jy at 5.5 and 9 GHz, respectively. Afterglow modelling of GRB 181123B showed that the addition of the ATCA force-fitted radio flux densities to the Swift X-ray Telescope detections provided more…
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