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GCN Circular 34070

Subject
GRB 230622A: ATCA rapid radio follow-up
Date
2023-06-23T13:30:09Z (10 months ago)
From
Gemma Anderson at Curtin U <gemma.anderson@curtin.edu.au>
G. E. Anderson (Curtin), J. K. Leung (USyd), A. J. van der Horst (GWU), L. Rhodes (Oxford), A. Gulati (USyd), S. Chastain (UNM) on behalf of the PanRadio GRB collaboration

The Australia Telescope Compact Array (ATCA) rapidly performed radio observations of the long GRB 230622A (Melandri et al. GCN 34058) at 5.5 and 9 GHz as part of the Large ATCA “PanRadio GRB” follow-up programme C3542 (PI. Anderson). ATCA was on target observing at 11:30 UT, just 1.5 hrs post-burst and observed for 10 hrs. Only 4 of the usual 6 antennas were available. Due to poor observing conditions, only ~6 hrs of data at each frequency were imaged. There is no radio source coincident with the enhanced XRT position (Evans et al. GCN 34069) with a 3 sigma upper limit of 54 and 48 microJy/beam at 5.5 and 9.0 GHz, respectively. Further observations are planned.

We thank the CSIRO Space and Astronomy staff for supporting these observations and maintaining the ATCA rapid-response observing mode. 

We acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.
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