{
  "bibcode": "2005GCN..3932....1P",
  "body": "D. Perley, J. S. Bloom, M. Cooper (UCB), J. Newman (LBL), P.  \nGuhatakurta (UCSC), J. X. Prochaska (UCO Lick) and H.-W. Chen (MIT/U  \nChicago) report on behalf of a larger group:\n\n\"We observed the field of GRB 050904 (GCN 3910) using the DEIMOS  \nimager on the Keck II during the early morning twilight of 05 Sept  \n2005 UT.  The afterglow candidate reported by Haislip et al. (GCN  \n3913, 3922) is well-detected in the first 300-second I-band exposure,  \ntaken at UTC=14:50 (~37.0 hours after the burst).  Calibrating  \nagainst three nearby stars in SDSS, we measure a preliminary  \nmagnitude for the afterglow of i~=22.9 +/- 0.6. This uncertainty is  \ndominated by the photometric calibration which we expect to improve  \nwith further processing.\"\n\nThis message may be cited.",
  "circularId": 3932,
  "createdOn": 1126033083000,
  "email": "jbloom@astron.berkeley.edu",
  "subject": "GRB 050904: Keck I-band Imaging",
  "submitter": "Josh Bloom at UC Berleley  <jbloom@astron.berkeley.edu>",
  "eventId": "GRB 050904"
}