{
  "bibcode": "2016GCN.19134....1E",
  "body": "S.W.K. Emery (UCL-MSSL) and A. P. Beardmore (U Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 160303A\n109 s after the BAT trigger (Beardmore et al., GCN Circ. 19126).\nWe detect a fading source consistent with the XRT position\n(Beardmore et al. GCN Circ. 19126) and the RATIR optical and NIR afterglow\ndetections (Butler et al. GCN Circ 19131)\nin the initial UVOT u filter exposures.\n\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           109         259          147         >21.9\nu_FC                   321         571          246          20.75\nwhite                 109          2061        450         >22.5\nb                         576          2037        136         >19.9\nw1                      700          2161           77         >20.5\nm2                     1426        1445           19         >19.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.02 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 19134,
  "createdOn": 1457036146000,
  "email": "samuel.emery.15@ucl.ac.uk",
  "subject": "GRB 160303A: Swift/UVOT Detection",
  "submitter": "Sam Emery at MSSL-UCL  <samuel.emery.15@ucl.ac.uk>",
  "eventId": "GRB 160303A"
}