TITLE: GCN CIRCULAR NUMBER: 39111 SUBJECT: LIGO/Virgo/KAGRA S250201i: Coverage and upper limits from MAXI/GSC observations DATE: 25/02/01 06:33:44 GMT FROM: Satoshi Sugita at Aoyama Gakuin U. sugita@phys.aoyama.ac.jp

S. Sugita, M. Serino, Y. Kawakubo, 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 S250201i at 2025-02-01 02:08:41.292 UTC.

At the trigger time of S250201i, the high-voltage of MAXI/GSC was off, and it was turned on at T0+844 sec (+14.1 min). The first one-orbit (92 min) scan observation with GSC after the event covered 98% of the 90% credible region of the bayestar skymap from 03:09:42 to 03:22:16 UTC (T0+3661 to T0+4415 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.

View this GCN Circular online at https://gcn.nasa.gov/circulars/39111. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...