TITLE: GCN CIRCULAR NUMBER: 18557 SUBJECT: LIGO/Virgo G194575: MAXI/GSC further analysis DATE: 15/11/04 06:26:10 GMT FROM: Nobuyuki Kawai at Tokyo Tech/MAXI M. Serino (RIKEN), H. Negoro (Nihon U.), N. Kawai (Tokyo Tech), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), M. Arimoto, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, R.Imatani (Osaka U.), M. Nakajima, K. Tanaka, T. Masumitsu (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori (Kyoto U.), Y. Tsuboi, S. Kanetou (Chuo U.), M. Yamauchi, D. Itoh (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Morii (ISM) report on behalf of the MAXI team: We analyzed the MAXI/GSC all-sky X-ray data (2-10 keV) for the two days following the LVC trigger G194575 (Singer et al. GCN 18442). We did not detect new sources in the LIGO candidate regions. The 3-sigma upper limits are shown below for the two 24-hour integrations after the trigger. Region Center 0-24h 24h-48h ------------ --------- ---------- (13h, -15.) 8 mCrab 9 mCrab (13.5h, -5.) 8 mCrab 9 mCrab (01h, +5.) 12 mCrab 12 mCrab ------------ --------- ---------- As in the previous report for the single orbit image (Serino et al. GCN 18467), about half of the candidate region around 13h in R.A. and half of the region around 13.5h were not observed to avoid the sun.