{
  "bibcode": "2019GCN.26580....1L",
  "body": "T. Laskar (University of Bath), S. Bhandari (CSIRO), K. D.\nAlexander (Northwestern), E. Berger (Harvard), R. Chornock (Ohio U.), D.\nCoppejans (Northwestern), M. Drout (U. Toronto), H. van Eerten (University\nof Bath), Wen-fai Fong (Northwestern), C. Guidorzi (U. Ferrara), G.\nHosseinzadeh (Harvard), R. Margutti (Northwestern), C. G. Mundell\n(University of Bath), and P. Schady (University of Bath) report:\n\n\"We observed GRB 191221B (Laha et al., GCN 26534) with the Australia\nTelescope Compact Array (ATCA) at multiple frequencies and multiple epochs\nbeginning on 2019 December 22 14:17 UT (0.73 days after the burst). We\ndetect a varying radio counterpart at 5.5, 9.0, 16.7, and 21.2 GHz at a\nposition consistent with the X-ray position (Beardmore et al., GCN 26540)\nand optical position (Lipunov et al., GCN 26537). We identify this source\nas the radio afterglow of GRB 191221B.\n\nFurther analysis and observations are on-going.\n\nWe thank the CSIRO staff for approving these observations.\"",
  "circularId": 26580,
  "createdOn": 1577292215000,
  "email": "tanmoylaskar@gmail.com",
  "subject": "GRB 191221B: ATCA detection of the radio afterglow",
  "submitter": "Tanmoy Laskar at U of Bath  <tanmoylaskar@gmail.com>",
  "eventId": "GRB 191221B"
}