GCN Circular 9684
Subject
GRB 090715B: Lick observations
Event
Date
2009-07-17T17:28:04Z (17 years ago)
From
Daniel Perley at U.C. Berkeley <dperley@astro.berkeley.edu>
D. A. Perley, J. Choi, A. Morton and M. Ganeshalingam (UC Berkeley) report:
We obtained a series of R-band exposures of the optical transient
associated with GRB 090715B (GCN 9668, Vetere et al.; GCN 9670, Smith et
al.) at the 1-meter Nickel telescope at Lick Observatory under clear skies
and good seeing. The transient is detected in individual frames. We
report the following magnitudes relative to the calibration star of
Malesani et al. (GCN 9671):
t_start(UT) exp(s) mag t-t0(hr)
06:17:06.10 120 R = 20.23 +/- 0.21 9.23
06:27:36.17 200 R = 20.27 +/- 0.16 9.41
06:31:53.21 200 R = 20.06 +/- 0.14 9.48
06:42:53.80 300 R = 20.48 +/- 0.17 9.66
06:54:57.78 300 R = 20.40 +/- 0.16 9.86
07:01:01.97 300 R = 20.39 +/- 0.20 9.96
07:07:07.30 300 R = 20.24 +/- 0.14 10.07
07:19:01.36 300 R = 20.47 +/- 0.18 10.26
07:32:15.82 300 R = 20.71 +/- 0.23 10.44
A stack of all images gives an average magnitude of R = 20.23 +/- 0.07.