TITLE:   GCN CIRCULAR
NUMBER:  24259
SUBJECT: LIGO/Virgo S190426c: MAXI/GSC Observations
DATE:    19/04/27 04:15:07 GMT
FROM:    Satoshi Sugita at Aoyama Gakuin U.  <sugita@phys.aoyama.ac.jp>

S. Sugita, M. Serino (AGU), M. Sugizaki, N. Kawai (Tokyo Tech),  H.
Negoro (Nihon U.),
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 (Miyazaki U.),
T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU)
report on behalf of the MAXI team:

We examined the MAXI/GSC all-sky X-ray images (2-20 keV) obtained
in the orbit after the LVC trigger
S190426c at 2019-04-26 15:21:55.337 UTC (GCN 24237).

At the trigger time of S190426c, the high-voltage of MAXI/GSC was off,
and it was turned on at T0+750 sec (=T0+12.5 min).
The one-orbit (92 min) scan of GSC covered 84% of the 90% credible region
of the bayestar1 skymap from 15:34:25 to 16:36:43　UTC (T0+750 to T0+4488 sec).

No significant new source was found in the region at the one-orbit scan.
The 1-sigma averaged upper limit obtained
from the scan was 18 mCrab at 4-10 keV.

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