TITLE:   GCN CIRCULAR
NUMBER:  20203
SUBJECT: GRB 161123A: MAXI/GSC detection
DATE:    16/11/23 04:51:45 GMT
FROM:    Motoko Suzuki at RIKEN  <motoko@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.

[GCN OPS NOTE(23nov16): Per author's request, the Subject was corrected
from 151123A to 161123A.]