MAXI/GSC detection of a giant X-ray flare from the active binary system CC Eri
ATel #3837; F. Suwa, M. Asada, H. Negoro (Nihon U.) M. Sugizaki, T. Mihara, M. Serino, S. Nakahira, T. Yamamoto, T. Sootome, M. Matsuoka (RIKEN), M. Nakajima, H. Sakakibara (Nihon U.), S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA), N. Kawai, M. Morii, K. Sugimori, R. Usui, T. Toizumi, Y. Aoki, S. Song (Tokyo Tech), A. Yoshida, K. Yamaoka (AGU), H. Tsunemi, M. Kimura, H. Kitayama (Osaka U.), Y. Ueda, K. Hiroi, M. Shidatsu (Kyoto U.), Y. Tsuboi, T. Matsumura, K. Yamazaki (Chuo U.), M. Yamauchi, Y. Nishimura, T. Hanayama (Miyazaki U.) report on behalf of the MAXI team
on 30 Dec 2011; 17:24 UT
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
Subjects: X-ray, Binary, Variables
The MAXI/GSC nova alert system triggered on a flare-like event from
the position consistent with the active binary system CC Eri
during a scan transit at 9:23 on December 30, 2011 (MJD 55925.3910).
Any source was not detected significantly (< 20 mCrab at 4-10 keV) with MAXI/GSC
during the previous transit at 7:50 on December 30.
Assuming that the source fluxes are constant over the transits,
the 2-4 keV and 4-10 keV fluxes are 109±32 mCrab and 126±30 mCrab, respectively,
during the transit at 9:23, and 22±17 mCrab and 20±20 mCrab at 10:55.
If the source is indeed CC Eri, the detected flux at 9:23 is
corresponding to the isotropic luminosity of approximately
3-4e31 erg/s, which is more than ten times higher than
those of previous X-ray flares (e.g., Schmitt et al. 1987, Pan and Jordan 1995).
The latest data are available at http://maxi.riken.jp/top/index.php?cid=1&jname=J0234-437 .
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