[vsnet-grb-info 18754] GRB 151123A: MAXI/GSC detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20203
SUBJECT: GRB 151123A: MAXI/GSC detection
DATE:    16/11/23 04:51:45 GMT
FROM:    Motoko Suzuki at RIKEN  <motoko at crab.riken.jp>

C. Hanyu (Miyazaki U.), S. Nakahira (JAXA), H. Negoro (Nihon U.),
S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara (JAXA), 
Y. E. Nakagawa (JAMSTEC),
T. Mihara, M. Sugizaki, M. Serino, W. Iwakiri,  M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), 
N. Kawai, N.Isobe, S.Sugita, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara, S. Harita, Y. Muraki (Tokyo Tech), 
A. Yoshida, T. Sakamoto, Y. Kawakubo, Y. Kitaoka (AGU), 
H. Tsunemi, R. Shomura (Osaka U.), 
M. Nakajima, K. Tanaka, T. Masumitsu, T. Kawase (Nihon U.), 
Y. Ueda, T. Kawamuro, T. Hori, A. Tanimoto, S. Oda (Kyoto U.), 
Y. Tsuboi, Y. Nakamura, R. Sasaki (Chuo U.), 
M. Yamauchi, K. Furuya (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  03:05:58 UT on 2016 November 23.
The X-ray flux averaged over the scan was 149 +- 26 mCrab(4.0-10.0keV, 1 sigma error).
Without assumptions on the source constancy,we obtain a rectangular error
box for the transient source with the following corners:
(R.A., Dec) = (32.229, -40.884) deg = (02 08 54, -40 53 02) (J2000)
(R.A., Dec) = (31.566, -40.860) deg = (02 06 15, -40 51 36) (J2000)
(R.A., Dec) = (32.268, -38.340) deg = (02 09 04, -38 20 24) (J2000)
(R.A., Dec) = (32.905, -38.394) deg = (02 11 37, -38 23 39) (J2000)
There was no significant excess flux in the previous transit at UT 01:33 
and in the next transit at 04:38 UT with an upper limit of 20 mCrab for each.