{
  "bibcode": "2016GCN.20029....1M",
  "body": "F. E. Marshall (NASA/GSFC) and V. D'Elia (ASDC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 161011A\n118 s after the BAT trigger (D'Elia et al., GCN Circ. 20023).\nNo optical afterglow consistent with the XRT position\n(Osborne et al., GCN Circ. 20026) 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           118          268          147         >20.7\nu_FC               330          580          246         >20.0\nwhite              118         1009          334         >21.1\nv                  660         6564          255         >19.4\nb                  586        11301          252         >20.3\nu                  330        11089         1170         >20.6\nw1                 709         6889          152         >20.4\nm2                6569         6769          197         >20.3\nw2                1015         6359          216         >20.0\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.07 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 20029,
  "createdOn": 1476206628000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 161011A: Swift/UVOT Upper Limits",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 161011A"
}