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.

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