{
  "bibcode": "2011GCN.12406....1H",
  "body": "E. A. Hoversten (PSU) reports on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 110928A\n3342 s after the BAT trigger (Hoversten et al., GCN Circ. 12394).\nNo optical afterglow consistent with the XRT position (Osborne et al.,\nGCN Circ. 12402) is detected in the initial UVOT exposures. Preliminary\n3-sigma upper limits using the UVOT photometric system\n(Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC)\nexposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC          3342         3492          147         >20.2\nwhite             3342         4723          344         >21.0\nv                 3499         3698          197         >19.1\nb                 4319         4518          197         >21.0\nu                 4114         4313          197         >20.8\nw1                3909         4108          197         >20.3\nm2                3704         3903          197         >19.9\nw2                4729         4929          197         >21.6\n\nThe magnitudes in the table are not corrected for the Galactic  \nextinction\ndue to the reddening of E(B-V) = 0.03 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 12406,
  "createdOn": 1317242308000,
  "email": "hoversten@astro.psu.edu",
  "subject": "GRB 110928A: Swift/UVOT Upper Limits",
  "submitter": "Erik Hoversten at Swift/Penn State  <hoversten@astro.psu.edu>",
  "eventId": "GRB 110928A"
}