{
  "bibcode": "2022GCN.32609....1B",
  "body": "A. Belles (PSU) and S. B. Cenko (GSFC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 220930A\n180 s after the BAT trigger (Cenko et al., GCN Circ. 32603).\nNo optical afterglow consistent with the XRT position\n(Evans et al. GCN Circ. 32608)\nis detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwh_FC              180          330          147            >20.71\nu_FC               338          588          245            >19.95\nwh                 618         1368          225            >20.93\nv                  669         1418           97            >18.73\nb                  594         1343           77            >19.59\nu                  744         1318           58            >18.99\nw1                 719         1467           77            >18.83\nm2                 693         1442           77            >18.59\nw2                 644         1393           97            >19.10\n\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.639 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 32609,
  "createdOn": 1664570350000,
  "email": "aub1461@psu.edu",
  "subject": "GRB 220930A: Swift/UVOT Upper Limits",
  "submitter": "Alexander Belles at PSU/Swift  <aub1461@psu.edu>",
  "eventId": "GRB 220930A"
}