{
  "bibcode": "2013GCN.15065....1M",
  "body": "F. E. Marshall (NASA/GSFC) and K. L. Page (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 130803A\n93 s after the BAT trigger (Page et al., GCN Circ. 15059).\nNo optical afterglow consistent with the enhanced XRT position\n(Osborne et al. GCN Circ. 15062)\nis 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\nfinding chart (FC) exposures and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC            93          243          147         >21.0\nu_FC               305          555          246         >20.3\nwhite               93         6186          560         >21.7\nv                  636        11010         1142         >20.8\nb                  561         5981          413         >21.0\nu                  305         5776          639         >20.7\nw1                3936        16308          788         >21.4\nm2                5167        11916         1082         >21.2\nw2                4757         6392          393         >20.9\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",
  "circularId": 15065,
  "createdOn": 1375582153000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 130803A: Swift/UVOT Upper Limits",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 130803A"
}