{
  "bibcode": "2011GCN.12569....1O",
  "body": "S. R. Oates (MSSL-UCL) and V. Mangano (INAF-IASFPA)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 111117A\n137 s after the BAT trigger (Mangano et al., GCN Circ. 12559).\nNo optical afterglow consistent with the XRT position\n(Melandri et al., GCN Circ. 12565) or the optical position \n(Andersen et al., GCN Circ. 12563 & Fong et al., GCN Circ. 12566) is \ndetected in the initial UVOT exposures.\n\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\nu_FC               137          387          246         >20.4\nv                  443         1241           97         >19.3\nb                  392         1191          117         >20.0\nu                  137         1315          490         >20.7\nw1                 493         1290           97         >20.4\nm2                 468         1117           78         >19.5\nw2                 419         1217           97         >21.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.03 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 12569,
  "createdOn": 1321614267000,
  "email": "sro@mssl.ucl.ac.uk",
  "subject": "GRB 111117A: Swift/UVOT Upper Limits",
  "submitter": "Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>",
  "eventId": "GRB 111117A"
}