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GCN Circular 34433

GRB 230812B: AMI-LA radio detection of afterglow candidate
2023-08-15T10:57:05Z (8 months ago)
Lauren Rhodes at Oxford <>
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Lauren Rhodes, Joe Bright, Rob Fender (Oxford), Dave Green, Dave Titterington (Cambridge) report:

We observed the field of the gamma-ray burst GRB 230812B (GCN 34286) with the Arcminute Microkelvin Imager Large-Array (AMI-LA) at 15.5 GHz beginning at UT 18:13:51.9 on 14-Aug-2023 for a total of 4 hours. The flux standard 3c286 was used to calibrate the bandpass response and flux scale of the AMI-LA and J1658+4737 was used as an interleaved complex gain calibrator.
We detect a unresolved source at a position consistent with the one reported in GCN 34394 with a (preliminary) peak flux density of 280uJy/beam. The rms noise in the field is 40uJy/beam. Further observations are planned.

We thank the staff at the Mullard Radio Astronomy Observatory for carrying out these observations and operating the AMI-LA.

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