TITLE:   GCN CIRCULAR
NUMBER:  33893
SUBJECT: LIGO/Virgo/KAGRA S230529ay: Coverage and upper limits from MAXI/GSC observations
DATE:    23/05/30 05:13:28 GMT
FROM:    Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>

S. Sugita, M. Serino (AGU),
H. Negoro (Nihon U.),
N. Kawai (RIKEN), 
M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.),
T. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN),
T. Sakamoto, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU),
Y. Tsuboi, S. Urabe, S. Nawa, N. Nemoto (Chuo U.),
M. Shidatsu (Ehime U.),
I. Takahashi, M. Niwano, S. Sato, N. Higuchi, Y. Yatsu (Tokyo Tech),
S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, T. Kurihara (JAXA),
Y. Ueda, K. Setoguchi, T. Yoshitake, Y. Nakatani (Kyoto U.),
M. Yamauchi, Y. Hagiwara, Y. Umeki, Y. Otsuki (Miyazaki U.),
K. Yamaoka (Nagoya U.),
Y. Kawakubo (LSU),
M. Sugizaki (NAOC),
W. Iwakiri (Chiba U.) 
report on behalf of the MAXI team:

We examined MAXI/GSC all-sky X-ray images (2-20 keV)
after the compact binary merger candidate S230529ay at 2023-05-29 18:15:00.746 UTC (GCN 33889).

At the trigger time of S230529ay, the high-voltage of MAXI/GSC was off
The first one-orbit (92 min) scan observation with GSC after the event covered 91%
of the 90% credible region of the Bilby skymap (GCN 33891) from 18:31:41 to 19:40:39 UTC (T0+1001 to T0+5139 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.