TITLE:   GCN CIRCULAR
NUMBER:  18784
SUBJECT: LIGO/Virgo G211117: MAXI/GSC observations
DATE:    15/12/31 14:39:15 GMT
FROM:    Nobuyuki Kawai at Tokyo Tech/MAXI  <nkawai@phys.titech.ac.jp>

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

We examined the MAXI/GSC all-sky X-ray images (2-10 keV) obtained
in the orbits immediately preceding and following the LVC trigger
G211117 at 2015-12-26T03:38:53 UTC (Singer et al. GCN 18728).

In each of the 92-min orbits, MAXI/GSC scanned more than 80% 
of the whole sky, which includes approximately half of the 
high-significance regions in the bayestar skymap.
No significant new source was found in these scans.

The upper limits for the X-ray flux are different depending 
on the part of the sky.
For instance, the 2-10 keV 1-sigma upper limits obtained at the center 
of the OT source region (Lipunov et al. GCN 18729) are 
26 mCrab at 03:32 and 22 mCrab at 05:04 on December 26.