{
  "bibcode": "2011GCN.12672....1S",
  "body": "C. A. Swenson (PSU) reports on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 111212A\n3272 s after the BAT trigger (Campana et al., GCN Circ. 12667).\nNo optical afterglow consistent with the XRT position\n(Osborne et al., GCN Circ. 12670) is detected in the initial\nUVOT exposures. Preliminary 3-sigma upper limits using the UVOT\nphotometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373)\nfor the first finding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC          3272         3422          147 >20.3\nwhite             3272         5481          541 >21.3\nv                 4255         5751          255 >19.2\nb                 3637         5276          393 >20.1\nu                 3432         5071          393 >20.1\nw1                4665         4865          197 >20.1\nm2                4460         4660          197 >20.3\nw2                4050         5687          393 >21.0\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.05 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 12672,
  "createdOn": 1323705348000,
  "email": "cswenson@astro.psu.edu",
  "subject": "GRB 111212A: Swift/UVOT Upper Limits",
  "submitter": "Craig Swenson at PSU/Swift  <cswenson@astro.psu.edu>",
  "eventId": "GRB 111212A"
}