TITLE: GCN CIRCULAR NUMBER: 39179 SUBJECT: LIGO/Virgo/KAGRA S250206dm: Coverage and upper limits from MAXI/GSC observations DATE: 25/02/07 00:26:56 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University kawakubo@phys.aoyama.ac.jp

N. Kawai, T. Mihara, (RIKEN), H. Negoro, M. Nakajima, K. Takagi (Nihon U.), S. Sugita, M. Serino, Y. Kawakubo, H. Hiramatsu, H. Nishikawa, 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 S250206dm at 2025-02-06 21:25:30.439 UTC (GCN #39175, 39178).

At the trigger time of S250206dm, the high-voltage of MAXI/GSC was off, and it was turned on at T0+786 sec (+13.1 min). The first one-orbit (92 min) scan observation with GSC after the event covered 52% of the 90% credible region of the Bilby skymap from 21:38:56 to 22:48:26 UTC (T0+806 to T0+4976 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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