{
  "circularId": 34304,
  "createdOn": 1690847225608,
  "eventId": "LIGO/Virgo/KAGRA S230731an",
  "subject": "LIGO/Virgo/KAGRA S230731an: Coverage and upper limits from MAXI/GSC observations",
  "body": "M. Nakajima, H. Negoro,  (Nihon U.),\nT. Mihara, N. Kawai (RIKEN),\nS. Sugita, M. Serino, H. Hiramatsu, H. Nishikawa, Y. Kondo (AGU),\nY. Kawakubo (LSU)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter compact binary merger candidate S230731an at 2023-07-31 21:53:07\nUTC (GCN 34303).\n\nAt the trigger time of S230731an, the high-voltage of MAXI/GSC was off,\nand it was turned on at T0+628 sec (+10.5 min).\nThe first one-orbit (92 min) scan observation with GSC after the event\ncovered 95%\nof the 90% credible region of the bayestar skymap from 22:03:35 to\n23:07:43 UTC (T0+628 to T0+4476 sec).\n\nNo significant new source was found in the region in the one-orbit\nscan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n",
  "submitter": "Satoshi Sugita at Aoyama Gakuin U. <sugita@phys.aoyama.ac.jp>",
  "bibcode": "2023GCN.34304....1N",
  "submittedHow": "email"
}