[vsnet-grb-info 16132] GRB 150206A: MAXI/GSC detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17414
SUBJECT: GRB 150206A: MAXI/GSC detection
DATE:    15/02/06 16:27:56 GMT
FROM:    H. Negoro at Nihon U.  <negoro at phys.cst.nihon-u.ac.jp>

H. Negoro (Nihon U.), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, 
Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Serino, M. Morii, 
J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN),
N. Kawai, T. Yoshii, Y. Tachibana (Tokyo Tech), 
A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU),
H. Tsunemi, D. Uchida (Osaka U.), M. Nakajima, K. Fukushima, T. Onodera, 
K. Suzuki, M. Fujita, F. Honda, T. Namba (Nihon U.),
Y. Ueda, M. Shidatsu, T. Kawamuro, T. Hori (Kyoto U.),
Y. Tsuboi, A. Kawagoe (Chuo U.), M. Yamauchi, Y. Morooka, D. Itoh (Miyazaki U.),
K. Yamaoka (Nagoya U.) report on behalf of the MAXI team:

We report the MAXI/GSC detection of GRB 150206A (Hagen et al. GCN 17413) 
in the scan transit at 14:50 on 2015 February 06 UT, about 20 min after
the BAT trigger.

Assuming that the source flux was constant over the transit,
we obtain the source position at
(R.A., Dec) = (10.174 deg, -63.382 deg) = (00 40 41, -63 22 55) (J2000) 
with a statistical 90% C.L. elliptical error region 
with long and short radii of 0.34 deg and 0.28 deg respectively. 
The roll angle of long axis from the north direction is 82.0 deg 
counterclockwise. There is an additional systematic uncertainty of 0.1 deg 
(90% containment radius). 
The position is consistent with that of GRB 150206A.

The X-ray flux averaged over the scan was 116 +- 25 mCrab (4-10keV, 1 sigma 
error). 
There was no significant excess flux in the previous transit at UT 13:21
with an upper limit of 20 mCrab.