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MAXI/GSC detection of a bright X-ray flare from the dMe star AU Mic

ATel #13635; W. Iwakiri, R. Sasaki (Chuo U.), H. Negoro, M. Nakajima, M. Aoki, K. Kobayashi, R. Takagi, K, Asakura, K, Seino, S. Mokumoto (Nihon U.), T. Mihara, C. Guo, Y. Zhou, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, H. Nishida, A. Yoshida (AGU), Y. Tsuboi, 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 (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:
on 15 Apr 2020; 14:12 UT
Credential Certification: Wataru Iwakiri (wataru.iwakiri@riken.jp)

Subjects: X-ray, Star, Transient

Referred to by ATel #: 15139

The MAXI/GSC nova alert system triggered on a bright X-ray flare from the position consistent with the dMe type star AU Mic during a scan transit at 03:03 UT on Apr 15 2020. The estimated X-ray flux in the 2 - 10 keV band of this flare during this scan transit is about 2.9 (+0.7, -1.2) x 10-9 erg/cm-2/s. Assuming a distance of 9.8 pc (GaiaCollaboration et al.2018), the peak luminosity is about 3 x 1031 erg/s. In the next scan transit 04:36 UT data of MAXI, the X-ray flare is still marginally detected with a significance of 2.9 sigma. If we assume that the flare flux decayed exponentially with time, the estimated e-folding time and the total energy in the 2 - 10 keV band of this flare are about 3500 sec and 1 x 1035 erg, respectively.