GCN Circular 7062
Subject
GRB 071112C: Optical and NIR afterglows observed with KANATA
Date
2007-11-12T20:07:47Z (17 years ago)
From
Makoto Uemura at Hiroshima U <uemuram@hiroshima-u.ac.jp>
M. Uemura, M. Sasada, A. Arai, and T. Uehara (Hiroshima Univ.),
report on behalf of the KANATA GRB team:
We performed optical-NIR observations of the field of
GRB 071112C (GCN Circ. 7059) with TRISPEC attached to
the "KANATA" 1.5-m telescope.
We found a fading object at the position of the optical
afterglow detected with UVOT.
Our preliminary results are below:
time(UT) mag. exposure_time
Nov. 2007 (sec)
12.77880 17.76 +/- 0.14 V 30sec * 10
12.77911 16.39 +/- 0.22 J 25sec * 9
12.78674 18.66 +/- 0.20 V 123sec * 5
12.78672 17.16 +/- 0.17 J 120sec * 5
Comparison star:
V-band: GSC2.3 02:36:55.72 +28:21:03.7 V=14.15
J-band: 2MASS 02:36:55.72 +28:21:03.7 J=12.674
The large errors of magnitudes are due to the rapidly
fading trend of the afterglow.
Further observation and analysis are ongoing.