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GCN Circular 7863

Subject
GRB080605: optical observation with the MITSuME-OAO telescope
Date
2008-06-09T00:24:33Z (16 years ago)
From
Michitoshi Yoshida at Okayama Astrophysical Obs <yoshida@oao.nao.ac.jp>
M. Yoshida, K. Yanagisawa, D. Kuroda, Y. Shimizu, S. Nagayama,
H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf
of the MITSuME collaboration:

We performed optical imaging observation (Rc, and Ic) of the field
of GRB 080605 (Sbarufatti et al., GCN 7828) with 50cm MITSuME
telescope at Okayama Astrophysical Observatory June 6 2008 UT.
We detected a point source at the UVOT position of the optical
afterglow (Kuin et al., GCN 7844). Differential photometry was
made using a USNO B1.0 star, USNO-ID 0940-0289655 (Kann et al.,
GCN 7845). The Ic-band magnitude of the source was almost constant
from T-T0 = 0.516 to 0.756. The source is about 1.5 magnitude
fainter in Rc-band than in Ic-band. These results are consistent
with other reports (Kann et al., GCN 7845, Rumyantsev et al.,
GCN 7857).


MITSuME observation start: 2008-06-06 11:35:11 UT

mid-UT        T-T0(days)   exp-T         Ic
(2008-06-06)
---------------------------------------------------
12:11:27      0.516314     60 min    19.03 +/- 0.38
12:48:05      0.541753     60 min    19.00 +/- 0.29
14:00:54      0.592315     60 min    18.85 +/- 0.18
15:15:44      0.644288     60 min    19.03 +/- 0.22
16:30:50      0.696429     60 min    18.82 +/- 0.21
17:56:24      0.755856     80 min    18.87 +/- 0.30
---------------------------------------------------

mid-UT
(2008-06-06)  T-T0(days)   ext-T          Rc
---------------------------------------------------
15:52:20      0.669745     120 min   20.58 +/- 0.32
---------------------------------------------------
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