GCN Circular 10248
Subject
GRB 091127: GAO 150cm telescope Optical Observation
Date
2009-12-05T08:59:45Z (15 years ago)
From
Kenzo Kinugasa at Gunma Astro. Obs/Japan <kinugasa@astron.pref.gunma.jp>
K. Kinugasa, S. Honda, O. Hashimoto, H. Takahashi, H. Taguchi
(Gunma Astronomical Observatory) report:
The position of GRB 091127 (Troja et al., GCN 10191) was observed
with the 150 cm telescope of Gunma Astronomical Observatory.
Starting at 13:45:44 and 14:04;55 UT on Nov.28 ( about 14.3 and
14.7 hours after the trigger), Ic and Rc frames were acquired
for sets of 5 x 3-min and 5 x 3-min exposures, respectively.
We detected the optical counterpart (e.g., Smith et al., GCN 10192;
Immler et al., GCN 10193) in all frames. We estimated the Rc and Ic
magnitudes relative to USNO-B1.0 R2 and I magnitudes, respectively.
mid-UT T0+(d) exp mag.
-----------------------------------------------
13:54:51 0.6035 5x3min Rc=18.37+-0.13
14:16:39 0.6187 5x3min Ic=18.62+-0.32
-----------------------------------------------
The R magnitude is well fitted with the fading trend from the other
observations (e.g., Xu et al. GCN 10205; Sndreev et al. GCN 10207;
Haislip et al. GCN 10219).