{
  "bibcode": "2022GCN.32371....1K",
  "body": "N. J. Klingler (GSFC/UMBC/CRESTII) and A. D'Ai (INAF-IASFPA)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 220711B\n114 s after the BAT trigger (D'Ai et al., GCN Circ. 32366).\nNo optical afterglow consistent with the XRT position\n(Beardmore et al. GCN Circ. 32370)\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\nwhite_FC           114          264          147         >21.0\nu_FC               326          576          246         >20.2\nwhite              114          915          221         >21.0\nv                  655         4601          236         >19.7\nb                  581          773           39         >19.7\nu                  326         5120          368         >20.4\nw1                 704         5011          216         >20.5\nm2                 852         4806          216         >19.4\nw2                 631         4396          216         >20.4\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.067 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 32371,
  "createdOn": 1657602153000,
  "email": "njk5441@psu.edu",
  "subject": "GRB 220711B: Swift/UVOT Upper Limits",
  "submitter": "Noel Klingler at NASA-GSFC / UMBC  <njk5441@psu.edu>",
  "eventId": "GRB 220711B"
}