{
  "bibcode": "2014GCN.16869....1B",
  "body": "A. A. Breeveld (UCL-MSSL) and M. De Pasquale (INAF-IASFPA) report on \nbehalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 140930B \n201s after the BAT trigger (De Pasquale et al., GCN Circ. 16857).\nNo optical afterglow consistent with the XRT position (Goad et al., GCN \nCirc. 16865) or the optical position (Tanvir et al., GCN Circ. 16861) is \ndetected 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           201          351          147         >20.2\nwhite              201         2579          528         >20.9\nv                  507         2629          253         >18.8\nb                  433         2787          311         >19.9\nu                  407         2702          253         >19.4\nw1                 383         2678          253         >19.4\nm2                 358         2653          214         >19.3\nw2                 483         2605          253         >19.7\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": 16869,
  "createdOn": 1412169737000,
  "email": "a.breeveld@ucl.ac.uk",
  "subject": "GRB 140930B: Swift/UVOT Upper Limits",
  "submitter": "Alice Breeveld at MSSL-UCL  <a.breeveld@ucl.ac.uk>",
  "eventId": "GRB 140930B"
}