GCN Circular 6922
Subject
GRB 071011: MITSuME Optical Observations
Date
2007-10-16T14:41:48Z (17 years ago)
From
Nobuyuki Kawai at Tokyo Tech <nkawai@hp.phys.titech.ac.jp>
D. Kuroda, K. Yanagisawa, M. Yoshida (NAOJ), T. Ishimura, and N. Kawai
(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB071011 (Marshall et al., GCN 6882) with
the 3-color 50cm MITSuME Telescope at Okayama Astrophysical
Observatory, and 3-color 105cm Telescope at Ishigakijima Astronomical
Observatory. The observations started at 12:50:06 Oct.11 (9m53s after
the trigger) at Okayama, and at 13:04:15 Oct.11 (24m02s after the
trigger) at Ishigakijima.
In the co-added images of Ic and Rc bands (Okayama), and
Ic, Rc, and V bands (Ishigakijima), we detected the optical
afterglow reported by Cenko et al. (GCN 6895).
We estimate the magnitudes relative to the USNO B1.0 catalog.
The results are followings.
### Results at Okayama ###
start end Exposure Ic mag Rc mag
-------------------------------------------------------
12:50:06 13:00:06 10 x 60 s 18.2 +/- 0.4 19.0 +/- 0.3
13:02:48 13:12:48 10 x 60 s 19.2 +/- 0.4 19.5 +/- 0.4
13:15:26 13:25:26 10 x 60 s 19.3 +/- 0.4 --
-------------------------------------------------------
### Results at Ishigakijima ###
start end Exposure Ic mag Rc mag V mag
-----------------------------------------------------------------------
13:04:15 13:19:14 5 x 60 s 18.6 +/- 0.2 20.1 +/- 0.2 --
13:25:17 13:58:09 5 x 60 s 19.1 +/- 0.4 19.9 +/- 0.2 --
13:04:15 13:58:09 10 x 60 s -- -- 21.0 +/- 0.5
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