[vsnet-grb-info 17176] GRB 151027A: MAXI/GSC detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18525
SUBJECT: GRB 151027A: MAXI/GSC detection
DATE:    15/10/29 11:01:12 GMT
FROM:    H. Negoro at Nihon U.  <negoro at phys.cst.nihon-u.ac.jp>

T. Masumitsu, H. Negoro, (Nihon U.), N. Kawai (Tokyo Tech), T. Sakamoto (AGU),
S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA),
T. Mihara, M. Sugizaki, M. Serino, M. Shidatsu, J. Sugimoto, 
T. Takagi, M. Matsuoka (RIKEN), T. Yoshii, Y. Tachibana (Tokyo Tech), 
A. Yoshida, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, R. Imatani (Osaka U.), 
M. Nakajima, K. Tanaka (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori (Kyoto U.), 
Y. Tsuboi, S. Kanetou (Chuo U.), M. Yamauchi, D. Itoh (Miyazaki U.), 
K. Yamaoka (Nagoya U.), M. Morii (ISM)
report on behalf of the MAXI team:

MAXI/GSC performed scanning observations at the region of 
GRB 151027A (Maselli et al. GCN 18478) for 48 sec each 
at the centroid time 03:38:56, 1168 s before the Swift trigger, and 
05:11:32, 4388 s after the Swift trigger.
No positive 4-10 keV flux was obtained at the former scan transit
with the 3 sigma upper limit of 0.037 photons/cm2/s (~ 31 mCrab).
At the latter scan transit, the 4-10 keV flux was 0.0166 +/- 0.0175 
photons/cm2/s (~ 14 +/- 15 mCrab). 
The detection is not significant, but the flux is consistent with 
the interpolation from the Swift/XRT light curve (V. D'Elica et al. #18509).