[vsnet-grb-info 8950] GRB100219A Akeno and Okayama MITSuME Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10440
SUBJECT: GRB100219A Akeno and Okayama MITSuME Optical Observation
DATE:    10/02/20 03:43:34 GMT
FROM:    Daisuke Kuroda at OAO/NAOJ  <dikuroda at oao.nao.ac.jp>

D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), H. Nakajima,
Y.Yatsu, Y.A.Mori, A.Endo, T. Shimokawabe, and N. Kawai(Tokyo Tech),
S. Nagayama (NAOJ), M. Yoshida (Hiroshima) and K. Ohta (Kyoto)
report on behalf of the MITSuME collaboration:

We observed the field of GRB 100219A (Rowlinson et al. GCN 10430)
with the optical three color (g', Rc and Ic) CCD camera attached
to the MITSuME 50cm telescope of Akeno Observatory and Okayama
Astrophysical Observatory. We found the afterglow at the XRT
position (Holland et al. GCN 10432, Rowlinson et al. GCN 10435
and Evans et al. GCN 10437) in Rc and Ic band.

The coordinates of the object are:
RA(J2000.0)   10:16:48.50 (+- 0.5 arcsec)
DEC(J2000.0) -12:34:00.6  (+- 0.3 arcsec)

But we could not detect the optical afterglow previously
reported by Holland and Rowlinson (GCN 10436)

Photometric results and three sigma upper limits of the OT are
listed below. We used GSC2.3 catalog for flux calibration.

Akeno Observatory:
The observation started on 2010-02-19 15:17:30 UT (104s after the
trigger).
PDAY     MID-UT    T-EXP    g'      Rc       Ic
-----------------------------------------------------
0.00471  15:22:34   540.0        19.8+-0.3 18.5+-0.3
----------------------------------------------------

Okayama Astrophysical Observatory:
The observation started on 2010-02-19 15:20:08 UT (262 sec after
the trigger).
PDAY     MID-UT    T-EXP    g'      Rc       Ic
-----------------------------------------------------
0.00675  15:25:30   540.0 >19.1   >19.0    17.8+-0.2
0.01428  15:36:21   540.0 >19.1   >19.1    17.5+-0.1
0.02177  15:47:07   540.0 >19.1  18.4+-0.2 18.1+-0.3
0.06589  16:50:40  3000.0 >19.4   >19.7    18.9+-0.3
-----------------------------------------------------