TITLE:   GCN CIRCULAR
NUMBER:  20900
SUBJECT: LIGO/Virgo G277583 : MAXI/GSC observations
DATE:    17/03/18 03:17:07 GMT
FROM:    Satoshi Sugita at Tokyo Inst. of Tech.  <sugita@hp.phys.titech.ac.jp>

S. Sugita, N. Kawai (Tokyo Tech), M. Serino (RIKEN), H. Negoro (Nihon U.),
S. Ueno, H. Tomida, S. Nakahira, M. Ishikawa, Y. Sugawara (JAXA),
Y. E. Nakagawa (JAMSTEC),
T. Mihara, M. Sugizaki, W. Iwakiri, M. Shidatsu, J. Sugimoto, T.
Takagi, M. Matsuoka (RIKEN),
N. Isobe, 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:

We examined the MAXI/GSC all-sky X-ray images (2-20 keV) obtained
in the orbit and the day after the LVC trigger
G277583 at 2017-03-13 22:40:09.593 UTC (GCN 20860).

At the trigger time of G277583,
the high-voltage of MAXI/GSC was off,
and on from T0+682 sec.
GSC scanned more than 74%
of the whole sky in the 92-min orbit, which includes 78.3% of the
90% regions in the skyprobcc_cWB skymap.
One day image covers 97.5% of the 90% regions
in the skyprobcc_cWB skymap.
No significant new source was found in these images.
The upper limits for the X-ray flux are different depending
on the part of the sky.
For instance, typical 2-20 keV 1-sigma (3-sigma) upper limits obtained
from the one-orbit and one-day images are
13(39) mCrab and  3(9) mCrab, respectively,

If you require information of X-ray flux by MAXI/GSC at specific coordinates,
please contact the submitter of this circular by email.