{
  "bibcode": "2022GCN.32618....1L",
  "body": "James Leung (University of Sydney/CSIRO), Ziteng Wang (University of\nSydney/CSIRO), Emil Lenc (CSIRO), Tara Murphy (University of Sydney)\n\nThe Australia Telescope Compact Array (ATCA) observed GRB 220921A\n(Pillera et al., GCN 32568) at multiple frequencies starting on 2022\nSeptember 28, from 16:30 to 21:00 UTC (7.2 to 7.4d post-trigger).\n\nWe detect a radio source in all bands at the position:\nRA (J2000) = 04:25:53.4\nDec (J2000) = -40:24:20.5\n\nwith uncertainty ~0.5\" in each coordinate, which is consistent with \nthe MASTER optical (Lipunov et al., GCN 32570) and ALMA mm (Laskar\net al., GCN 32577) candidate afterglow positions. \n\nWe report our preliminary flux density measurements below:\n\nFreq (GHz) | Peak Flux Density (micro-Jy/beam)\n----------------------------------------------\n5.5        | 163 +/- 19\n9.0        | 364 +/- 17\n16.7       | 763 +/- 50\n21.2       | 988 +/- 95\n\nOngoing observations are planned. \n\nWe thank CSIRO staff for rapidly scheduling and supporting these\nobservations.",
  "circularId": 32618,
  "createdOn": 1664779793000,
  "email": "jleu9465@uni.sydney.edu.au",
  "subject": "GRB 220921A: ATCA detection of radio counterpart",
  "submitter": "James Leung at U of Sydney/VAST  <jleu9465@uni.sydney.edu.au>",
  "eventId": "GRB 220921A"
}