GCN Circular 6975
Subject
GRB071021: MITSuME Okayama Optical Upper Limits
Event
Date
2007-10-22T06:03:35Z (19 years ago)
From
Michitoshi Yoshida at Okayama Astrophysical Obs <yoshida@oao.nao.ac.jp>
M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda
(NAOJ), and N. Kawai (Tokyo Tech) report on behalf of the
MITSuME collaboration:
We observed the field of GRB071021 (Sakamoto et al., GCN6958)
with the three-color 50cm MITSuME Telescope at Okayama
Astrophysical Observatory. The observations started at 9:45:30
Oct. 21 UT (3m58s after the trigger). No new point source was
found in the XRT error circle of this burst (Barbier et al.,
GCN6966). The 3-sigma upper limits derived with the USNO B1.0
catalog are followings.
-------------------------------------------------------------
Mid time Exp time G Rc Ic
-------------------------------------------------------------
2007-10-21 9:57:03 20min (60s x 20) >19.4 >19.1 >18.7
2007-10-21 10:48:01 99min (60s x 99) >20.3 >19.6 >19.3
-------------------------------------------------------------