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GCN Circular 33475

Subject
GRB 230307A: ATCA radio detection
Date
2023-03-14T05:23:06Z (a year ago)
From
Gemma Anderson at Curtin U <gemma.anderson@curtin.edu.au>
G. E. Anderson (Curtin Uni.), J. K. Leung (U. Sydney), T. Murphy (U. Sydney), E. Lenc (CSIRO)
L. Rhodes (U. Oxford), A. J. van der Horst (GWU), G. Rowell (U. Adelaide)

We observed GRB 230703A (Fermi GBM Team GCN 33405) with the Australia Telescope
Compact Array (ATCA) between 2023-03-12_02:30 UT and 2023-03-12_07:30 UT
(~4.5 days post-burst). In our preliminary analysis, we detect a radio source coincident
with the X-ray (Burrows et al. GCN 33429, GCN 33465) and optical (Levan et al. GCN 33439)
counterpart with a flux density of 120+/-30 microJy/beam at 9 GHz. We also obtain an
3 sigma upper limit of 90 microJy/beam at 5.5 GHz.

We thank CSIRO staff for supporting these observations.

The ATCA is part of the Australia Telescope National Facility which is funded by the Australian
Government for operation as a National Facility managed by CSIRO. We acknowledge the Gomeroi
people as the traditional owners of the Observatory site.
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