{
  "bibcode": "2012GCN.12951....1O",
  "body": "S. R. Oates (MSSL-UCL) and T. Sakamoto (NASA/UMBC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 120213A\n59 s after the BAT trigger (Sakamoto et al., GCN Circ. 12942).\nNo optical afterglow consistent with the XRT position\n(Beardmore et al., GCN Circ. 12948) is detected 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\nwhite_FC            59          209          147         >19.8\nu_FC               271          521          246         >19.7\nwhite               59        12944         1454         >21.6\nv                  602         6546          294         >20.4\nb                  527        12032         1219         >20.5\nu                  271         7161          717         >20.6\nw1                 653         6956          471         >19.8\nm2                6551         6751          197         >19.8\nw2                 578        13010          332         >20.1\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.22 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 12951,
  "createdOn": 1329136520000,
  "email": "sro@mssl.ucl.ac.uk",
  "subject": "GRB 120213A: Swift/UVOT Upper Limits",
  "submitter": "Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>",
  "eventId": "GRB 120213A"
}