Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 3932

GRB 050904: Keck I-band Imaging
2005-09-06T18:58:03Z (19 years ago)
Josh Bloom at UC Berleley <>
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."

This message may be cited.
Looking for U.S. government information and services? Visit