GCN Circular 34088
N. Kawai (RIKEN), H. Negoro, M. Nakajima (Nihon U.), T. Mihara (RIKEN), S. Sugita, M. Serino, H. Hiramatsu, H. Nishikawa (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 S230627c at 2023-06-27 01:53:37.819 UTC (GCN 34086). At the trigger time of S230627c, the high-voltage of MAXI/GSC was on. The instantaneous field of view of GSC at the GW trigger time covered 5% 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 64% of the 90% credible region of the bayestar skymap from 01:53:37 to 03:25:36 UTC (T0+0 to T0+5519 sec). No significant new source was found in the region in the one-orbit scan observation. Because the 90% credible region of this event was observed by degraded camera, a typical 1-sigma averaged upper limit obtained in one scan observation is 140 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.