{
  "bibcode": "2009GCN..9751....1S",
  "body": "C. A. Swenson (PSU) and Cannizzo (NASA/UMBC)report on behalf of the\nSwift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 090807\n164 s after the BAT trigger (Cannizzo et al., GCN Circ. 9746).\nNo optical afterglow consistent with the XRT position (Beardmore et al.,\nGCN Circ. 9748) is detected in the initial UVOT exposures.\nPreliminary 3-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           164          313          147         >21.2\nu_FC               322          571          246         >20.1\nwhite              164         1026          295         >21.1\nu                  322          571          246         >20.1\n\nThe values quoted above are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.18 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 9751,
  "createdOn": 1249689445000,
  "email": "cswenson@astro.psu.edu",
  "subject": "GRB 090807: Swift/UVOT Upper Limits",
  "submitter": "Craig Swenson at PSU/Swift  <cswenson@astro.psu.edu>",
  "eventId": "GRB 090807"
}