{
  "bibcode": "2013GCN.15476....1C",
  "body": "M.M. Chester and M. C. Stroh (PSU) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of the Fermi/LAT-detected \nGRB 131108A 25920 s after the LAT trigger (Racusin et al., GCN Circ. 15464).\nA source consistent with the XRT position (Stroh and Kennea GCN Circ. 15474)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n   RA  (J2000) =  10:26:00.45 = 156.50187 (deg.)\n   Dec (J2000) = +09:39:44.1  =   9.66225 (deg.)\nwith an estimated uncertainty of 0.58 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            27746        28046          295         19.70 +/- 0.10\nb                26833        27133          295         19.67 +/- 0.16\nu                25920        26220          295         19.10 +/- 0.14\nw1               31699        32599          886         20.96 +/- 0.33\nm2               37465        37914          442        >20.6\nw2               45446        49794         1069        >21.4\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.028 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 15476,
  "createdOn": 1384016056000,
  "email": "chester@astro.psu.edu",
  "subject": "GRB 131108A: Swift/UVOT Detection",
  "submitter": "Margaret Chester at PSU  <chester@astro.psu.edu>",
  "eventId": "GRB 131108A"
}