{
  "bibcode": "2011GCN.12540....1K",
  "body": "N. P. M. Kuin (MSSL-UCL) and M. H. Siegel (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of\nGRB 111107A  73 s after the BAT trigger (Siegel et al.,\nGCN Circ. 12534).\n\nPreliminary detections and 3-sigma upper limits using the UVOT\nphotometric system (Poole et al. 2008, MNRAS, 383, 627)\nfor the early exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite               73          223          147         19.45 +/- 0.10\nv                  615         1755          136        >18.7\nb                  540         1681          117        >20.0\nu                  285         1656          343        >19.9\nw1                 664         1631          117        >19.2\nm2                 639         5231          299        >19.7\nw2                 590         1730          136        >20.0\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.14 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 12540,
  "createdOn": 1320675710000,
  "email": "npkuin@gmail.com",
  "subject": "GRB 111107A: Swift/UVOT Afterglow Analysis",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 111107A"
}