{
  "bibcode": "2021GCN.30479....1L",
  "body": "T. Laskar (U. of Bath) reports on behalf of a larger collaboration:\n\n\"Following the initial detection of the mm counterpart of GRB 210702A (Lien\net al., GCN 30351) with the Atacama Large Millimeter/Submillimeter Array\n(ALMA) on 2021 July 03, 26 h after the burst (Laskar & Perley, GCN 30423),\nwe have been monitoring this source with ALMA at 97.5 GHz. The mm-band\ncounterpart was observed to fade to a flux density of ~ 0.3 mJy in\nobservations taken on 2021 July 11 at a mid-time of 8.3 days after the\nburst.\n\nWe observed GRB 210702A with ALMA again beginning on 2021 July 20 21:02\nUTC. Preliminary analysis reveals a strong (~ 50 sigma) detection at 97.5\nGHz with a flux density of ~ 0.8 mJy at a mid-time of 18.1 days after the\nburst, implying a significant rebrightening of the mm-band afterglow,\ncontemporaneous to the radio rebrightening observed at 34, 21.2, and 16.7\nGHz with ATCA (Laskar & Bhandari, GCN 30477). Further observations are\nplanned.\n\nWe thank the JAO staff, AoD, P2G, and the entire ALMA team for their help\nwith these observations.\"",
  "circularId": 30479,
  "createdOn": 1626994241000,
  "email": "tanmoylaskar@gmail.com",
  "subject": "GRB 210702A: ALMA detection of mm-band rebrightening",
  "submitter": "Tanmoy Laskar at U of Bath  <tanmoylaskar@gmail.com>",
  "eventId": "GRB 210702A"
}