{
  "bibcode": "2013GCN.15568....1O",
  "body": "S. R. Oates (UCL-MSSL) and D. Kocevski (NASA/GSFC/ORAU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 131202A\n117 s after the BAT trigger (Kocevski et al., GCN Circ. 15559).\nNo optical afterglow consistent with the XRT position\n(Osborne et al., GCN Circ. 15564) 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 initial exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\nwhite_FC        117          267            147         >20.6\nwhite           117\t     1344           363         >21.2\nv               608\t     1231           78          >18.6\nb               534\t     1330           78          >19.6\nu_FC            277\t     527            246         >19.9\nu               277\t     1305           304         >20.1\nw1              657\t     1280           78          >19.0\nm2              632\t     1256           78          >18.9\nw2              583\t     1207           78          >19.3\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.03 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 15568,
  "createdOn": 1386075404000,
  "email": "sro@mssl.ucl.ac.uk",
  "subject": "GRB 131202A: Swift/UVOT Upper Limits",
  "submitter": "Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>",
  "eventId": "GRB 131202A"
}