TITLE:   GCN CIRCULAR
NUMBER:  37358
SUBJECT: LIGO/Virgo/KAGRA S240830gn: Coverage and upper limits from MAXI/GSC observations
DATE:    24/08/31 04:54:43 GMT
FROM:    Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>

Y. Kawakubo, S. Sugita, M. Serino,  H. Hiramatsu, H. Nishikawa, 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 S240830gn at 2024-08-30 21:11:20.392 UTC (GCN #37354, #37357).

At the trigger time of S240830gn, the high-voltage of MAXI/GSC was off,
and it was turned on at T0+374 sec (+6.2 min).
The first one-orbit (92 min) scan observation with GSC after the event covered 65%
of the 90% credible region of the Bilby skymap from 21:31:02 to 22:21:22 UTC (T0+1182 to T0+4202 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.