TITLE:   GCN CIRCULAR
NUMBER:  34315
SUBJECT: LIGO/Virgo/KAGRA S230802aq: Coverage and upper limits from MAXI/GSC observations
DATE:    23/08/02 14:23:47 GMT
FROM:    Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>

T. Mihara, N. Kawai (RIKEN),
H. Negoro, M. Nakajima (Nihon U.),
S. Sugita, M. Serino, H. Hiramatsu, H. Nishikawa, Y. Kondo (AGU),
Y. Kawakubo (LSU)
report on behalf of the MAXI team: 

We examined MAXI/GSC all-sky X-ray images (2-20 keV)
after compact binary merger candidate S230802aq at 2023-08-02 11:33:59 UTC (GCN #34314).

At the trigger time of S230802aq, the high-voltage of MAXI/GSC was on.
The instantaneous field of view of GSC at the GW trigger time covered 1% of the 90% credible region
of the bayestar sky map, in which we found no significant new X-ray source.
The first one-orbit (92 min) scan observation with GSC after the event covered 62%
of the 90% credible region of the bayestar skymap from 11:33:59 to 13:05:58 UTC (T0+0 to T0+5519 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.