TITLE: GCN CIRCULAR NUMBER: 34304 SUBJECT: LIGO/Virgo/KAGRA S230731an: Coverage and upper limits from MAXI/GSC observations DATE: 23/07/31 23:47:05 GMT FROM: Satoshi Sugita at Aoyama Gakuin U. sugita@phys.aoyama.ac.jp
M. Nakajima, H. Negoro, (Nihon U.), T. Mihara, N. Kawai (RIKEN), 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 S230731an at 2023-07-31 21:53:07 UTC (GCN 34303).
At the trigger time of S230731an, the high-voltage of MAXI/GSC was off, and it was turned on at T0+628 sec (+10.5 min). The first one-orbit (92 min) scan observation with GSC after the event covered 95% of the 90% credible region of the bayestar skymap from 22:03:35 to 23:07:43 UTC (T0+628 to T0+4476 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.
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