{
  "circularId": 34552,
  "subject": "GRB 230812B: radio detection with the VLA",
  "eventId": "GRB 230812B",
  "submitter": "Stefano Giarratana at University of Bologna <s.giarratana@ira.inaf.it>",
  "body": "S. Giarratana (University of Bologna, INAF-IRA), M. Giroletti\n(INAF-IRA), G. Ghirlanda (INAF-OAB), N. Di Lalla (Stanford Univ.),\nN. Omodei (Stanford Univ.)\n\nAt 01:52:24 UT on 2023 August 15 (T_mid = 2.3 days post-burst) the\nKarl G. Jansky VLA observed the field of GRB 230812B (Fermi GBM\nteam, GCN 34386) at a central frequency of 6 and 10 GHz.\n\nThe standard J1331+3030 was used as bandpass and flux density\ncalibrator, while J1637+4717 was used as phase calibrator.\n\nFrom a preliminary analysis, an unresolved radio source (Rhodes et al.,\nGCN 34433; de Ugarte Postigo et al., GCN 34468) is clearly detected\nat both frequencies at a position:\n\nRA: 16:36:31.477 +- 0.001\nDec: +47:51:32.25 +- 0.02\n\nThe surface brightness peak is 230 uJy/beam and 196 uJy/beam at 6\nand 10 GHz, respectively. The r.m.s. noise level of the images is\n10 uJy/beam and 7 uJy/beam at 6 and 10 GHz, respectively.\nThe synthesized beams are 0.31 x 0.26 arcsec (PA: -45deg) at 6 GHz\nand 0.20 x 0.16 arcsec (PA: -45deg) at 10 GHz.\n\nWe would like to thank the staff of the VLA for approving, executing,\nand processing the observations.\n\nThe National Radio Astronomy Observatory is a facility of the National\nScience Foundation operated under cooperative agreement by Associated\nUniversities, Inc.\n\nThese observations were carried out as part of project SF161095,\napproved in the framework of the Fermi - NRAO joint program agreement.\n",
  "bibcode": "2023GCN.34552....1G",
  "createdOn": 1692987457888,
  "submittedHow": "email"
}