{
  "bibcode": "2014GCN.16030....1D",
  "body": "M. De Pasquale (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 140323A\n106 s after the BAT trigger (Troja et al., GCN Circ. 16027).\nNo optical afterglow consistent with the XRT position\n(Osborne et al. GCN Circ. 16028) 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\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC           106          256          147         >20.4\nu_FC               319          569          246         >19.5\nwhite              106          793          186         >20.5\nv                  649         5918          216         >19.1\nb                  574        12334          773         >20.2\nu                  319         6532          462         >19.9\nw1                 698         6328          216         >19.5\nm2                5923        16174          725         >20.4\nw2                 798          818           19         >17.9\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": 16030,
  "createdOn": 1395604022000,
  "email": "m.depasquale@ucl.ac.uk",
  "subject": "GRB 140323A: Swift/UVOT Upper Limits",
  "submitter": "Massimiliano de Pasquale at MSSL-UCL  <m.depasquale@ucl.ac.uk>",
  "eventId": "GRB 140323A"
}