{
  "bibcode": "2016GCN.19854....1F",
  "body": "W. Fong (University of Arizona), K. D. Alexander (Harvard), and T. Laskar\n(NRAO/UC Berkeley) report:\n\n\"We observed the position of the short-duration GRB 160821B (Siegel et al.,\nGCN 19833) with the Karl G. Jansky Very Large Array (VLA) beginning on 2016\nAug 22.088 UT (3.6 hr post-burst) at a mean frequency of 5.0 GHz. In 1 hour\nof observations, we detect a faint radio source at the position:\n\nRA(J2000) = 18:39:54.56\nDec(J2000) = 62:23:30.3\n\nwith an uncertainty of 0.3\" in each coordinate. This position is consistent\nwith the position of the X-ray afterglow (Evans et al., GCN 19837), and\ncoincident with the position of the optical afterglow (Xu et al., GCN\n19834; Levan et al., GCN 19846).\n\nWe measure a preliminary 5.0 GHz flux density of ~35 microJy. To assess\nvariability, we obtained an additional set of VLA observations starting at\n26.5 hr after the burst. The source is no longer detected in these\nobservations to a 3-sigma limit of 18 microJy.\n\nDue to the fading of the radio source, as well as the positional\ncoincidence with the X-ray and optical afterglows, we suggest this source\nas the radio afterglow of GRB 160821B.\n\nWe thank the VLA staff for quickly executing these observations.\"",
  "circularId": 19854,
  "createdOn": 1472070139000,
  "email": "wfong@email.arizona.edu",
  "subject": "GRB 160821B: VLA 5.0 GHz observations",
  "submitter": "Wen-fai Fong at U of Arizona  <wfong@email.arizona.edu>",
  "eventId": "GRB 160821B"
}