GCN Circular 39179
Subject
LIGO/Virgo/KAGRA S250206dm: Coverage and upper limits from MAXI/GSC observations
Date
2025-02-07T00:26:56Z (4 days ago)
From
Yuta Kawakubo at Aoyama Gakuin University <kawakubo@phys.aoyama.ac.jp>
Via
Web form
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.