GCN Circular 6919
Subject
GRB 071010B: Keck/LRIS Photometry
Event
Date
2007-10-16T00:12:18Z (18 years ago)
From
Daniel Kocevski at UC Berkeley <kocevski@berkeley.edu>
D. Kocevski, D. A. Perley, J. S. Bloom, M. Modjaz, and D. Poznanski
(UC Berkeley)
report:
"In addition to the spectroscopic followup reported by Prochaska et
al. (GCN 6890), we acquired a 90s exposure in R band and a 30s
exposure in g and V bands of the field containing GRB 071010B with
the Keck I 10m telescope (+LRIS), beginning at 15:01:21 UT on
2007-10-11. The optical afterglow at 10:02:9.26, +45:43:50.3
reported by Oksanen et al. (GCN 6871) and confirmed by Kann et al.
(GCN 6884 ) was clearly detected. Using aperture photometry, we
estimate the multi-color magnitudes of the afterglow to be:
R = 19.62
V = 19.71
g = 19.10
when calibrated to Landolt standard star observations. We note that
the afterglow had not faded considerably from the magnitude reported
by Im et al. (GCN 6897) whose observations began approximately 4
hours earlier.