{
  "submittedHow": "email",
  "eventId": "GRB 231017A",
  "subject": "GRB 231017A: Swift/UVOT Upper Limit",
  "body": "A. A. Breeveld (UCL-MSSL) and T. Parsotan (GSFC/UMBC) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 231017A 73640 s after the GBM trigger (Mangan et al., GCN Circ. 34822).\nNo new sources are seen in the UVOT data.\nA preliminary 3-sigma upper limit using the UVOT photometric system, (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) at the position of the XRT candidate (Source 2) given by Dichiara et al. (GCN Circ. 34829) is:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nu                73640       101690        4839          >21.0\n\nThe magnitude in the table is not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.252 in the direction of the burst (Schlegel et al. 1998).\n",
  "submitter": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
  "createdOn": 1697740476976,
  "bibcode": "2023GCN.34844....1B",
  "circularId": 34844
}