GCN Circular 7305
Subject
GRB080212: Optical afterglow candidate observed by MITSuME Telescope
Date
2008-02-13T11:50:53Z (16 years ago)
From
Michitoshi Yoshida at Okayama Astrophysical Obs <yoshida@oao.nao.ac.jp>
M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama (OAO, NAOJ)
and N. Kawai (Tokyo Tech) report on behalf of the MITSuME
collaboration:
We performed optical imaging observation (g', Rc, and Ic) of the
field of GRB 080212 (Ziaeepour et al. GCN 7296) with 50cm MITSuME
telescope at Okayama Astrophysical Observatory from UT 17:36:37
(124 sec after the trigger) to UT 20:30:38 on Feb 12 2008.
We found a 18 mag star in the vicinity of the XRT position (Goad
et al. GCN 7300). This is the late-K star reported by Berger (GCN
7304). Although we could not spatially resolve the faint source
close to this star reported by Berger (GCN7304), we found that
a fading component is overlaid on the star. This component is
a GRB afterglow candidate. We estimated the magnitudes of the
fading component by subtracting the flux of the star at 2 hours
after the trigger from the star magnitude at early time.
The estimated magnitudes of the fading component are summarized
below.
Observation date 2008-02-12 UT
mid-UT exp-T g' Rc Ic
---------------------------------------------------------
17:42:47 10min 19.46+-0.26 17.77+-0.15 17.98+-0.22
18:00:27 22min > 21.0 18.77+-0.14 18.91+-0.21
18:19:08 52min > 21.0 19.88+-0.10 > 20.5
18:58:37 113min > 21.0 > 20.5 > 20.5
---------------------------------------------------------