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GCN Circular 7305

GRB080212: Optical afterglow candidate observed by MITSuME Telescope
2008-02-13T11:50:53Z (16 years ago)
Michitoshi Yoshida at Okayama Astrophysical Obs <>
M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama (OAO, NAOJ)
and N. Kawai (Tokyo Tech) report on behalf of the MITSuME

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

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
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