{
  "bibcode": "2016GCN.20217....1K",
  "body": "N. P. M. Kuin (UCL-MSSL) and D. Kocevski (NASA/GSFC/ORAU) report on\nbehalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 161129A\n86 s after the BAT trigger (Kocevski et al., GCN Circ. 20210).\nA source consistent with the XRT position (Beardmore et al. GCN Circ.\n20211) is detected in the initial UVOT exposures.\n\nThe source is detected in UVOT images at position:\nRA =  21h 04m 54.6s (J2000)\nDec = 32d 08' 05.52\" (J2000)\nwith an uncertainty of 0.6\" (90% confidence)\n\nPreliminary detections and 3-sigma upper limits using the UVOT\nphotometric 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               86         6356          400         20.61 +/- 0.20\nv                 3858         5493          393        >19.0\nb                  554         6314          413        >20.0\nu                  298         6109          639        >19.8\nw1                4268         5903          393        >19.4\nm2                4063         5698          393        >19.6\nw2                 604         5288          208        >19.5\n\nThere are low-significance signs of the source in all other filters. Though\nthe source seems to reach peak brightness around 500s the photometric\nerrors are also consistent with a constant source brightness up to 10ks.\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.21 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 20217,
  "createdOn": 1480454405000,
  "email": "npkuin@gmail.com",
  "subject": "GRB 161129A: Swift/UVOT Detection",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 161129A"
}