{
  "bibcode": "2014GCN.16618....1M",
  "body": "F. E. Marshall (NASA/GSFC) and R. L. C. Starling (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 140719A\n83 s after the BAT trigger (Starling et al., GCN Circ. 16606).\nNo optical afterglow consistent with the optical position\n(Bolmer et al. GCN Circ. 16611) or the enhanced XRT position\n(Evans et al. GCN Circ. 16607) is detected in the initial UVOT exposures.\nNearby bright sources in this crowded field make estimating the\nbackground more difficult than usual.\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            83          233          147         >20.9\nu_FC               296          546          246         >20.2\nwhite               83         1026          334         >21.3\nv                  626         4558          178         >19.2\nb                  552          745           39         >19.5\nu                  296          720          265         >20.2\nw1                 676          870           39         >19.0\nm2                 651          845           39         >21.0\nw2                 602         1052           58         >19.0\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.14 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 16618,
  "createdOn": 1405978919000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 140719A: Swift/UVOT Upper Limits",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 140719A"
}