{
  "bibcode": "2018GCN.22439....1S",
  "body": "S. A. Sebzda (PSU) and J. K. Cannizzo (NASA/UMBC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 180222A\n83 s after the BAT trigger (Cannizzo et al., GCN Circ. 22433).\nNo optical afterglow consistent with the XRT position\n(Cannizzo et al. GCN Circ. 22433)\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            83          233          147         >20.6\nu_FC               295          545          246         >19.5\nwhite               83         1196          353         >21.6\nv                  624         1073           58         >18.0\nb                  551         1171           58         >18.6\nu                  295         1146          285         >19.7\nw1                 673         1122           58         >18.0\nm2                 649         1097           58         >18.0\nw2                 600         1221           78         >19.3\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 1.68 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 22439,
  "createdOn": 1519418977000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 180222A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 180222A"
}