TITLE: GCN CIRCULAR NUMBER: 29082 SUBJECT: IceCube-201209A : MAXI/GSC upper limit DATE: 20/12/18 04:29:17 GMT FROM: Motoko Serino at RIKEN/MAXI M. Serino (AGU), T. Mihara (RIKEN), H. Negoro, M. Nakajima, M. Aoki, K. Kobayashi, R. Takagi, K, Asakura, K, Seino (Nihon U.), T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, H. Nishida, K. Komachi, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, R. Adachi, M. Niwano (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, U. Goto, R. Uematsu (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, K. Kurogi, K. Miike (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC) report on behalf of the MAXI team: We report the non-detection of MAXI/GSC of the neutrino event IceCube-201209A (GCN #29012). At 10:39:17 UT on 2020-12-09 (about 23.6 min after the event trigger), MAXI/GSC scanned the error region of the event at (R.A., Dec) = (6.8600, -9.2500) (J2000) with a radius of 65.40 arcmin. No significant excess emission was detected from the region. A typical 1-sigma averaged upper limit in one scan observation is 20 mCrab at 2-20 keV.