TITLE:   GCN CIRCULAR
NUMBER:  36454
SUBJECT: LIGO/Virgo/KAGRA S240513cx: Coverage and upper limits from MAXI/GSC observations
DATE:    24/05/13 14:56:39 GMT
FROM:    Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>

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

We examined MAXI/GSC all-sky X-ray images (2-20 keV)
after compact binary merger candidate S240513cx at 2024-05-13 12:14:18.837 UTC.

At the trigger time of S240513cx, the high-voltage of MAXI/GSC was off,
and it was turned on at T0+1386 sec (+23.1 min).
The first one-orbit (92 min) scan observation with GSC after the event covered 41%
of the 90% credible region of the bayestar skymap from 12:37:28 to 13:40:48 UTC (T0+1390 to T0+5190 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.