[vsnet-grb-info 15693] GRB 141029A: MAXI/GSC detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16981
SUBJECT: GRB 141029A: MAXI/GSC detection
DATE:    14/10/29 06:00:25 GMT
FROM:    Motoko Suzuki at RIKEN  <motoko at crab.riken.jp>

S. Nakahira (JAXA), H. Negoro (Nihon U.),
S. Ueno, H. Tomida, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA),
T. Mihara, M. Sugizaki, M. Morii, M. Serino, 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, T. Namba, M. Fujita, F. Honda (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:

The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 04:32:09 UT .
Assuming that the source flux was constant over the transit,
we obtain the source position at
(R.A., Dec) = (69.413 deg, -16.481 deg) = (04 37 39, -16 28 51) (J2000) 
with a statistical 90% C.L. elliptical error region 
with long and short radii of 0.28 deg and 0.23 deg respectively. 
The roll angle of long axis from the north direction is 170.0 deg counterclockwise. 
There is an additional systematic uncertainty of 0.1 deg (90% containment radius).
The X-ray flux averaged over the scan was 137 +- 24 mCrab
(4-10keV, 1 sigma error).
There was no significant excess flux in the previous transit at 02:59 UT.
with an upper limit of 20 mCrab.