{
  "bibcode": "2021GCN.31021....1S",
  "body": "G. Schroeder, W. Fong, A. Rouco Escorial, (Northwestern), T. Laskar (Univ.\nRadboud), E. Berger (Harvard) report:\n\n\"We observed the position of GRB 211023B (Dichiara et al. GCN 30960) with\nthe Karl G. Jansky Very Large Array (VLA) under program 21B-198 (PI: Fong)\nbeginning on 2021 October 27.51 UT (3.63 days post-burst) at a mean\nfrequency of 6 GHz.\n\nBased on preliminary analysis, in 1 hour of observations we do not detect\nany radio emission at or near the position of the optical afterglow and\nhost (Kuin et al. GCN 30975; Pozanenko et al. GCN 30972; Kann et al. GCN\n30995; O'Connor et al., GCN 31000; Rastinejad et al., GCN 31002; Pozanenko\net al., GCN 31003) to a 3-sigma limit of 13 microJy. We also do not detect\nany source within the XRT position (Beardmore et al. GCN 30966).\nAdditional, detailed analysis is ongoing.\n\nWe thank the VLA staff for quickly approving and executing these\nobservations.\"",
  "circularId": 31021,
  "createdOn": 1635449180000,
  "email": "genevieveschroeder2023@u.northwestern.edu",
  "subject": "GRB 2121023B: 6 GHz VLA radio upper limit",
  "submitter": "Genevieve Schroeder at Northwestern University  <genevieveschroeder2023@u.northwestern.edu>",
  "eventId": "GRB 212102"
}