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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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