{
  "bibcode": "2013GCN.15032....1S",
  "body": "M. H Siegel and C. A. Swenson (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 130725B\n72 s after the BAT trigger (Swenson et al., GCN Circ. 15029).\nA source consistent with the XRT position\n(Swenson et al. GCN Circ. 15029)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n  RA  (J2000) =  14:16:57.76 = 214.24068 (deg.)\n  Dec (J2000) = -11:07:41.8  = -11.12827 (deg.)\nwith an estimated uncertainty of 0.50 arc sec. (radius, 90% confidence).\n\nPreliminary detections 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               72          221          147         17.29 +/- 0.03\nu                  284          534          246         17.96 +/- 0.07\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.061 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 15032,
  "createdOn": 1374789397000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 130725B: Swift/UVOT Detection of an Optical Counterpart",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 130725B"
}