{
  "bibcode": "2017GCN.20451....1S",
  "body": "M. H. Siegel (PSU) and B. Mingo (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 170112A\n279 s after the BAT trigger (Mingo et al., GCN Circ. 20436).\nNo optical afterglow consistent with the BAT position\n(Lien et al., GCN Circ. 20443) is detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC           856         1006          147         >20.5\nu_FC               279          529          246         >19.9\nwhite              856         6361          344         >21.0\nv                 5136         6771          393         >19.2\nb                 5956         6156          197         >20.0\nu                  279         7338          593         >20.4\nw1                5546         7180          393         >19.9\nm2                5341         6975          393         >20.2\nw2                6366         6566          197         >20.0\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.02 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 20451,
  "createdOn": 1484324262000,
  "email": "siegel@swift.psu.edu",
  "subject": "GRB 170112A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <siegel@swift.psu.edu>",
  "eventId": "GRB 170112A"
}