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GCN Circular 37448

Subject
LIGO/Virgo/KAGRA S240910ci: Coverage and upper limits from MAXI/GSC observations
Date
2024-09-10T13:06:47Z (23 days ago)
From
Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>
Via
Web form
H. Hiramatsu, S. Sugita, M. Serino, Y. Kawakubo, 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 S240910ci at 2024-09-10 10:35:35.495 UTC (GCN #37446, 37447).

At the trigger time of S240910ci, the high-voltage of MAXI/GSC was on.
The instantaneous field of view of GSC at the GW trigger time covered 6% of the 90% credible region
of the Bilby sky map, in which we found no significant new X-ray source.
The first one-orbit (92 min) scan observation with GSC after the event covered 51%
of the 90% credible region of the Bilby skymap from 10:35:35 to 10:45:20 UTC (T0+0 to T0+585 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.
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