[vsnet-grb-info 5172] GRB 071010A: Keck/LRIS Photometry
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Oct 11 06:16:46 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6872
SUBJECT: GRB 071010A: Keck/LRIS Photometry
DATE: 07/10/10 21:16:37 GMT
FROM: Josh Bloom at UC Berkeley <jbloom at astron.berkeley.edu>
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 6864), we acquired imaging of the GRB 071010A field in g and
R band with the Keck I 10m telescope (+LRIS) starting in twilight and
continuing until the object set. The fading afterglow reported by
Klotz et al. (GCN 6860) is well-detected.
Photometry, calculated relative to the USNO B1.0 catalog, is as follows:
t_start(min) R err
67.497 18.025 +/- 0.03
71.041 18.080 +/- 0.03
189.225 18.784 +/- 0.02
194.482 18.806 +/- 0.02
199.457 18.827 +/- 0.02
201.544 18.846 +/- 0.02
203.794 18.873 +/- 0.02
This photometry supersedes the preliminary report in GCN 6861 (Bloom
et al.). In addition, starting at 213 minutes after the trigger we
obtained a rapid series of 26 simultaneous g+R integrations of
typically 30 sec duration, lasting until 239 minutes after the
trigger. Analysis is ongoing."
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