{
  "subject": "GRB050908: detection of Swift/UVOT optical counterpart",
  "eventId": "GRB 050908",
  "bibcode": "2005GCN..3960....1D",
  "createdOn": 1126386581000,
  "circularId": 3960,
  "submitter": "Alexander Blustin at MSSL-UCL  <ajb@mssl.ucl.ac.uk>",
  "email": "ajb@mssl.ucl.ac.uk",
  "body": "M. De Pasquale (UCL-MSSL), M. Goad (U. Leicester), A. J. Blustin\n(UCL-MSSL), M. Chester (PSU), L. Angelini (GSFC-JHU),\nN. Gehrels (GSFC) on behalf of the Swift/UVOT team\n\nFurther analysis of the early Swift/UVOT data for GRB050908\n(Goad et al., GCN 3942) reveals a faint, decaying source at the\nposition of the optical counterpart reported by Torii (GCN 3943).\n\nIn summed V-band images taken between 104-650 s after the trigger,\na source is visible at 19.3 +/0.1 mag in a total exposure time of\n149 s. It is not detected in data taken later than this; in summed\nV-band images from 700-40650 s post-trigger a 3-sigma upper limit of\n20.5 mag is obtained at the same position in 2296 s of co-added\nexposure time. The source is only detected in the V band.\n\nThese magnitudes are uncorrected for extinction and are based on\npreliminary zero-points, measured in orbit, and will require\nrefinement with further calibration."
}