TITLE:   GCN CIRCULAR
NUMBER:  24577
SUBJECT: LIGO/Virgo S190517h: MAXI/GSC Observations
DATE:    19/05/17 11:51:01 GMT
FROM:    Mutsumi Sugizaki at Tokyo Tech./MAXI  <sugizaki.mutsumi@gmail.com>

M. Sugizaki, N. Kawai (Tokyo Tech), H. Negoro (Nihon U.),
M. Serino, S. Sugita (AGU),
M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.),
S. Nakahira, T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN),
T. Sakamoto, H. Nishida, A. Yoshida (AGU),
Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.),
M. Shidatsu (Ehime U.),
M. Oeda, K. Shiraishi (Tokyo Tech),
S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai,
M. Tominaga (JAXA),
Y. Ueda, A. Tanimoto, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake
(Kyoto U.),
H. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.),
M. Yamauchi, S. Iwahori, Y. Kurihara, K. Kurogi, K. Miike (Miyazaki U.),
T. Kawamuro (NAOJ),
K. Yamaoka (Nagoya U.),
Y. Kawakubo (LSU)

We examined the MAXI/GSC all-sky X-ray images (2-20 keV) obtained
in the orbit after the LVC trigger
S190517h at 2019-05-17 05:51:01.831 UTC (GCN 24570).

At the trigger time of S190517h, the high-voltage of MAXI/GSC was off,
and it was turned on at T0+70 sec (+1.2 min).
The one-orbit (92 min) scan of GSC covered 71% of the 90% credible region
of the bayestar sky-map.
One of the high-credible regions around RA=15h, Dec=-45deg., was missed
because it was in the direction to the ISS-rotation pole.

No significant new source was found in the error region with the one-orbit scan.
The 1-sigma averaged upper limit obtained from the scan was 20 mCrab
at 2-10 keV.

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