{
  "bibcode": "2022GCN.31682....1S",
  "body": "M. H. Siegel (PSU) and E. Troja (NASA/GSFC/UMCP)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 220302A\n32464 s after the BAT trigger (Troja et al., GCN Circ. 31661).\nNo optical afterglow consistent with the XRT position\n(Osborne et al. GCN Circ. 31666) is 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         32464        32614          147         >19.9\nwhite            32464        32614          147         >19.9\nv                32621        33528          885         >19.2\nm2               33533        34194          651         >19.7\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.217 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 31682,
  "createdOn": 1646451438000,
  "email": "mhs18@psu.edu",
  "subject": "GRB 220302A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <mhs18@psu.edu>",
  "eventId": "GRB 220302A"
}