TITLE:   GCN CIRCULAR
NUMBER:  35130
SUBJECT: LIGO/Virgo/KAGRA S231119ab: Coverage and upper limits from MAXI/GSC observations
DATE:    23/11/20 02:17:10 GMT
FROM:    Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>

M. Serino, S. Sugita, H. Hiramatsu, H. Nishikawa, Y. Kondo (AGU),
N. Kawai (RIKEN), H. Negoro, M. Nakajima (Nihon U.),
T. Mihara (RIKEN),
Y. Kawakubo (LSU)
report on behalf of the MAXI team:

We examined MAXI/GSC all-sky X-ray images (2-20 keV)
after compact binary merger candidate S231119ab at 2023-11-19 09:38:50 UTC.

At the trigger time of S231119ab, the high-voltage of MAXI/GSC was off,
and it was turned on at T0+843 sec (+14.1 min).
The first one-orbit (92 min) scan observation with GSC after the event covered 82%
of the 90% credible region of the cwb skymap from 09:52:55 to 11:03:41 UTC (T0+845 to T0+5091 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.