[vsnet-grb-info 22078] LIGO/Virgo S190425z: MAXI/GSC Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24177
SUBJECT: LIGO/Virgo S190425z: MAXI/GSC Observations
DATE:    19/04/25 12:50:24 GMT
FROM:    Mutsumi Sugizaki at Tokyo Tech./MAXI  <sugizaki.mutsumi at 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, T. Morita, S. Yamada, S. Ogawa (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
S190425z at 2019-04-25 08:18:05.017 UTC (GCN 24168).

At the trigger time of S190425z, the high-voltage of MAXI/GSC was off,
and it was turned on at T0+1054 sec (=T0+17.5 min).
The one-orbit (92 min) scan of GSC covered > 90% of the 90% error region
of the bayestar skymap from 08:35:39 to 09:50:05 UTC (T0+1054 to T0+5520 sec).

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