{
  "bibcode": "2013GCN.15545....1O",
  "body": "S. R. Oates (UCL-MSSL) and E. Sonbas (NASA/GSFC/Adiyaman Univ.)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 131128A\n91 s after the BAT trigger (Sonbas et al., GCN Circ. 15533).\nA source consistent with the optical position (Xu et al., GCN Circ. 15535) \nand the enhanced Swift-XRT position (Goad et al., GCN Circ 15538) is \ndetected in the first UVOT white exposure only. A USNO-B1 catalogued star \nheavily contaminates the position of the optical candidate afterglow \nmaking the measurement very complicated.\n\nPreliminary detection and 3-sigma upper limits using the UVOT \nphotometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) \nfor the early exposures are: \n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite (FC)          91          241           147        19.11 +/- 0.11\nwhite\t\t    583         1181          206    \t >21.44\nu (FC)              303         552           245        >20.2\nu                   303\t        1130          285    \t >20.3\nv                   632\t        1231          78         >19.0\nb                   558         1155          58         >19.8\nw1                  683\t        1275          53         >18.9\nm2                  657         1255          78         >19.0\nw2                  608\t        1206          78         >19.4\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.07 in the direction of the burst",
  "circularId": 15545,
  "createdOn": 1385726043000,
  "email": "sro@mssl.ucl.ac.uk",
  "subject": "GRB 131128A: Swift/UVOT Detection",
  "submitter": "Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>",
  "eventId": "GRB 131128A"
}