LIGO/Virgo/KAGRA S250920bq

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

We examined MAXI/GSC all-sky X-ray images (2-20 keV)
after compact binary merger candidate S250920bq at 2025-09-20 10:27:39.063 UTC.

At the trigger time of S250920bq, the high-voltage of MAXI/GSC was on,
but the FOV was out of the 90% credible region of the bayestar skymap.
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 10:30:54 to 10:46:39 UTC (T0+195 to T0+1140 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.