TITLE:   GCN CIRCULAR
NUMBER:  24609
SUBJECT: LIGO/Virgo S190519bj: MAXI/GSC Observations
DATE:    19/05/20 02:53:58 GMT
FROM:    Motoko Serino at RIKEN/MAXI  <motoko@crab.riken.jp>

N. Kawai, M. Sugizaki (Tokyo Tech), H. Negoro (Nihon U.), 
S. Sugita, M. Serino (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) 
report on behalf of the MAXI team:

We examined MAXI/GSC all-sky X-ray images (2-20 keV) 
after the LVC trigger S190519bj at 2019-05-19 15:35:44.398 UTC (GCN 24598).

At the trigger time of S190519bj, the high-voltage of MAXI/GSC was off, 
and it was turned on at T0+422 sec (=T0+7.0 min).
The first one-orbit (92 min) scan observation with GSC after the event covered 93% 
of the 90% credible region of the bayestar skymap from 15:42:46 to 16:47:22 UTC (T0+422 to T0+4298 sec).

No significant new source was found in the region in the one-orbit scan observation.
A typical 1-sigma averaged upper limit obtained in one scan observation
is 20 mCrab at 2-20 keV.

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