{
  "bibcode": "2013GCN.15443....1K",
  "body": "N. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), and J. R. Cummings (NASA/UMBC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 131103A\n87 s after the BAT trigger (Cummings et al., GCN Circ. 15440).\nA decaying source consistent with the XRT position  (Goad et al. GCN Circ. 15442)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  23:15:40.55 = 348.91894 (deg.)\n    Dec (J2000) = -44:38:25.4  = -44.64040 (deg.)\nwith an estimated uncertainty of 0.60 arc sec. (radius, 90% confidence).\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite               87          237          147         19.41 +/- 0.13\nwhite            19290        19893          599         21.45 +/- 0.17\nv                  629        12543         1173        >20.0\nb                  554        25509         1664         21.64 +/- 0.23\nu                  299          549          246         18.93 +/- 0.13\nw1                 678        24073         1116        >20.6\nw2                6741         6941          197        >19.8\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.01 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 15443,
  "createdOn": 1383580318000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 131103A: Swift/UVOT Detection",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 131103A"
}