GCN Circular 37520
Subject
LIGO/Virgo/KAGRA S240915b: Coverage and upper limits from MAXI/GSC observations
Date
2024-09-16T06:13:06Z (3 months ago)
From
Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>
Via
Web form
H. Nishikawa, S. Sugita, M. Serino, Y. Kawakubo, H. Hiramatsu, 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 S240915b at 2024-09-15 00:13:57.715 UTC (GCN 37512, 37513).
At the trigger time of S240915b, the high-voltage of MAXI/GSC was off,
and it was turned on at T0+707 sec (+11.8 min).
The first one-orbit (92 min) scan observation with GSC after the event covered 100%
of the 90% credible region of the Bilby skymap from 01:17:12 to 01:19:17 UTC (T0+3795 to T0+3920 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.