{
  "bibcode": "2013GCN.14768....1B",
  "body": "A. A. Breeveld (MSSL-UCL) and A. Melandri (INAF-OAB) report on behalf of \nthe Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 130604A \n109 s after the BAT trigger (Melandri et al., GCN Circ. 14752). No \noptical afterglow consistent with the optical position (Perley, GCN \nCirc. 14753) is detected 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 finding \nchart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC           109          258          147         >20.4\nwhite              109        17767         1345         >21.8\nv                 5004        11999         1055         >20.3\nb                 4388        16933         1278         >21.5\nu                  267         5818          378         >20.0\nw1                5414         5613          197         >20.0\nm2                5208         5408          197         >19.7\nw2                4798        11112         1082         >21.3\n\nThe magnitudes in the table are not corrected for the Galactic \nextinction due to the reddening of E(B-V) = 0.03 in the direction of the \nburst (Schlegel et al. 1998).",
  "circularId": 14768,
  "createdOn": 1370427308000,
  "email": "a.breeveld@ucl.ac.uk",
  "subject": "GRB 130604A: Swift/UVOT Upper Limits",
  "submitter": "Alice Breeveld at MSSL-UCL  <a.breeveld@ucl.ac.uk>",
  "eventId": "GRB 130604A"
}