{
  "bibcode": "2016GCN.18797....1S",
  "body": "M. H. Siegel (PSU) and V. D'Elia (ASDC) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began tiled observations of the field of the MAXI-detected\nburst GRB 160101A (Itoh et al. GCN Circ. 18793) 13.2 ks after the burst.  A\nfading optical source consistent with position of the XRT source reported by\nIzzo et al. (GCN Circ. 18795) is detected in the initial UVOT exposures in\nthe u filter.\n\nThe preliminary UVOT position is:\n     RA  (J2000) =  14:38:36.12 = 219.65051 (deg.)\n     Dec (J2000) = -13:48:55.4  = -13.81539 (deg.)\nwith an estimated uncertainty of 0.58 arc sec. (radius, 90% confidence).\n\nPreliminary detections and 3-sigma upper limits using the UVOT \nphotometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for \nthe early exposures are:\n\nFilter     T_start(s)   T_stop(s)   Exp(s)       Mag\nu           13195        13397       198     17.55+-0.10\nu           19592        19652        59     18.32+-0.32\n\nThe magnitudes in the table are not corrected for the Galactic \nextinction due to the reddening of E(B-V) = 0.09 in the direction of the \nburst (Schlegel et al. 1998).",
  "circularId": 18797,
  "createdOn": 1451663554000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 160101A: Swift/UVOT Detection",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 160101A"
}