{
  "bibcode": "2016GCN.19963....1K",
  "body": "Paul Kuin(MSSL-UCL) and S. L. Gibson (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 160927A\n85 s after the BAT trigger (Gibson et al., GCN Circ. 19952).\nNo optical afterglow consistent with the optical position\n(D'Avanzo et al. GCN Circ. 19956)\nis 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            85          235          147         >21.0\nu_FC               297          547          246         >20.4\nwhite               85        13184         1426         >21.8\nv                  627         6999          510         >19.9\nb                  553        12500         1179         >21.5\nu                  297        11587         1433         >21.1\nw1                 850         7411          491         >20.2\nm2                 826         7204          294         >20.5\nw2                 602         6794          510         >21.0\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.08 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 19963,
  "createdOn": 1475079238000,
  "email": "npkuin@gmail.com",
  "subject": "GRB 160927A: Swift/UVOT Upper Limits",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 160927A"
}