[vsnet-grb-info 10050] GRB 101225A: MAXI/GSC observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11505
SUBJECT: GRB 101225A: MAXI/GSC observations
DATE:    10/12/29 05:38:26 GMT
FROM:    Nobuyuki Kawai at Tokyo Tech  <nkawai at hp.phys.titech.ac.jp>

M. Serino, T. Mihara, Y.E. Nakagawa, M. Sugizaki, 
T. Yamamoto, T. Sootome, M. Matsuoka (RIKEN), 
N. Kawai, M. Morii, K. Sugimori, R. Usui (Tokyo Tech),
K. Kawasaki, S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA),
A. Yoshida, K. Yamaoka,  S. Nakahira (AGU),
H. Tsunemi, M. Kimura (Osaka U.), H. Negoro, M. Nakajima
H. Ozawa, F. Suwa (Nihon U.), Y. Ueda, N. Isobe, 
S. Eguchi, K. Hiroi (Kyoto U.), A. Daikyuji (Miyazaki U.), 
K. Yamazaki, A. Uzawa, T. Matsumura (Chuo U.),
report on behalf of the MAXI team:

MAXI/GSC observed the field of the Swift trigger 441015 = GRB 101225A
(Racusin et al, GCN 11493) before and after the trigger time.
The transit times (UT) and the observed fluxes in 2-10 keV energy band are

 15:51  (T-9988s)     -19 +- 11 mCrab
 17:23  (T-4483s)      20 +- 13 mCrab
 18:54  (T+1002s)      20 +- 15 mCrab
 20:05  (T+5218s)      11 +-  9 mCrab
 23:08  (T+16209s)      2 +-  7 mCrab

All the quoted uncertainties are 1-sigma statistical errors.

Note that the third transit occurred within the 1088-second Swift image trigger interval.  While it is not statistically significant, there appears be a weak X-ray enhancement at the location of the Swift trigger position during or near the BAT detection times (Cummings and Sakamoto, GCN 11504).