[vsnet-grb-info 25088] LIGO/Virgo S200224ca: Coverage and upper limits from MAXI/GSC observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  27188
SUBJECT: LIGO/Virgo S200224ca: Coverage and upper limits from MAXI/GSC observations
DATE:    20/02/25 00:31:00 GMT
FROM:    Motoko Serino at RIKEN/MAXI  <motoko at crab.riken.jp>

M. Serino, S. Sugita (AGU), 
N. Kawai (Tokyo Tech), H. Negoro (Nihon U.), 
M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi, R. Takagi (Nihon U.), 
T. Mihara, C. Guo, Y. Zhou, 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. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, 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), M. Sugizaki (NAOC) 
report on behalf of the MAXI team: 

We examined MAXI/GSC all-sky X-ray images (2-20 keV) 
after the LVC trigger S200224ca at 2020-02-24 22:22:34.406 UTC (GCN 27184). 

At the trigger time of S200224ca, the high-voltage of MAXI/GSC was off, 
and it was turned on at T0+12 sec (+0.2 min). 
The first one-orbit (92 min) scan observation with GSC after the event covered 100% 
of the 90% credible region of the bayestar skymap from 22:25:27 to 22:27:57 UTC (T0+173 to T0+323 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.