{
  "bibcode": "2012GCN.13397....1B",
  "body": "A. A. Breeveld (MSSL/UCL), F. E. Marshall (NASA/GSFC) and J.Racusin \n(GSFC) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 120624B\n60hours 45mins after the BAT trigger (Barthelmy et al., GCN Circ. 13381).\nNo optical afterglow is found at either of the XRT positions \n(Littlejohns et al. GCN 13394) nor the HAWKI position reported by \nD'Avanzo et al. (GCN 13391) 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 summed exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC        218726       218864          136         >20.9\nwhite           218865       260947         7027         >23.1\n\nThe magnitudes in the table are not corrected for the Galactic \nextinction due to the reddening of E(B-V) = 0.06 in the direction of the \nburst (Schlegel et al. 1998).",
  "circularId": 13397,
  "createdOn": 1340889420000,
  "email": "aab@mssl.ucl.ac.uk",
  "subject": "GRB 120624B: Swift/UVOT Upper Limits",
  "submitter": "Alice Breeveld at MSSL-UCL  <aab@mssl.ucl.ac.uk>",
  "eventId": "GRB 120624B"
}