GCN Circular 3932
Subject
GRB 050904: Keck I-band Imaging
Event
Date
2005-09-06T18:58:03Z (20 years ago)
From
Josh Bloom at UC Berleley <jbloom@astron.berkeley.edu>
D. Perley, J. S. Bloom, M. Cooper (UCB), J. Newman (LBL), P.
Guhatakurta (UCSC), J. X. Prochaska (UCO Lick) and H.-W. Chen (MIT/U
Chicago) report on behalf of a larger group:
"We observed the field of GRB 050904 (GCN 3910) using the DEIMOS
imager on the Keck II during the early morning twilight of 05 Sept
2005 UT. The afterglow candidate reported by Haislip et al. (GCN
3913, 3922) is well-detected in the first 300-second I-band exposure,
taken at UTC=14:50 (~37.0 hours after the burst). Calibrating
against three nearby stars in SDSS, we measure a preliminary
magnitude for the afterglow of i~=22.9 +/- 0.6. This uncertainty is
dominated by the photometric calibration which we expect to improve
with further processing."
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