GCN Circular 12174
Subject
GRB 110715A optical observations
Date
2011-07-19T12:16:46Z (13 years ago)
From
AAVSO GRB Network at AAVSO <matthewt@aavso.org>
Peter Nelson (Ellinbank, Victoria, Australia) reported to the AAVSO
International High Energy Network the following optical observations of
GRB 110715A (Sonbas et al., GCN #12158):
P. Nelson (Ellinbank Observatory, Ellinbank, VIC, Australia) reports a
detection of GRB 110715A from fifteen frames of 30-seconds exposure each
taken with a clear filter through a 0.32-cm PlaneWave f/8 CDK and SBIG
ST8XE camera. The magnitude derived from all frames is m(CR) = 18.0 +/-
0.2 at the mid-point exposure time of 2011 July 15 14:05:01 UT.
Magnitudes were measured relative to the USNO-B1.0 comparison star at RA:
15:50:41.62, Decl: -46:14:25.91 with magnitude R=15.21 (see Piranomonte et
al., GCN #12164).
Nelson reports that time-series was obtained by averaging the 15 frames
into three consecutive groups of five frames, yielding the following
magnitudes:
Time (UT) Mag (Clear, R zeropoint)
13:54:23 18.01 +/- 0.18
14:05:28 17.93 +/- 0.15
14:15:12 18.47 +/- 0.25
The position derived from these images is RA: 15:50:44.07, Decl:
-46:14:06.5, which is fully consistent with the optical position given by
Kuin et al. (GCN #12162).
The AAVSO International High Energy Network was made possible through
grants from the Charles Curry Foundation and from NASA.