TITLE: GCN CIRCULAR NUMBER: 41610 SUBJECT: LIGO/Virgo/KAGRA S250830bp: Coverage and upper limits from MAXI/GSC observations DATE: 25/08/30 14:05:37 GMT FROM: Satoshi Sugita at Aoyama Gakuin U. sugita@phys.aoyama.ac.jp
T. Mihara, N. Kawai (RIKEN), M. Nakajima, H. Negoro, K. Takagi (Nihon U.), S. Sugita, M. Serino, Y. Kawakubo, H. Hiramatsu, 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 S250830bp at 2025-08-30 10:24:18.852 UTC (GCN 41606, 41607).
At the trigger time of S250830bp, the high-voltage of MAXI/GSC was on, but the FOV was out of the 90% credible region of the Bilby skymap. The credible region was observed about 3 minutes before the GW trigger time with GSC, and the first one-orbit (92 min) scan observation after the event covered 100% of the 90% credible region from 11:52:34 to 11:53:19 UTC (T0+5296 to T0+5341 sec).
No significant new source was found in the region in those observations. 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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