LIGO/Virgo/KAGRA S231119ab: Coverage and upper limits from MAXI/GSC observations

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.