MAXI/GSC detection of the brightest X-ray outburst from 4U 1700+24
ATel #6850; K. Fukushima, K. Suzuki, T. Namba, H. Negoro (Nihon U.), N. Kawai (Tokyo Tech), M. Serino, J. Sugimoto (RIKEN), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Morii, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN), Y. Tachibana, T. Yoshii (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, D. Uchida (Osaka U.), M. Nakajima, T. Onodera, M. Fujita, F. Honda (Nihon U.), Y. Ueda, M. Shidatsu, T. Kawamuro, T. Hori (Kyoto U.), Y. Tsuboi, A. Kawagoe (Chuo U.), M. Yamauchi, Y. Morooka, D. Itoh (Miyazaki U.), K. Yamaoka (Nagoya U.)
on 26 Dec 2014; 10:25 UT
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
Subjects: X-ray, Binary, Neutron Star
The MAXI/GSC nova alert system triggered an X-ray brightening of the symbiotic X-ray binary 4U 1700+24. The source 4-10 keV flux has gradually increased since around MJD 56950 (2014 October 20), and reached approximately 120 mCrab on MJD 57017 (2014 December 26).
The source is one of the nearest X-ray binaries (~ 420 pc, Masetti et al. 2002). It has a long history of low X-ray activities with the maximum X-ray flux about 30 mCrab for 18 years (MJD 50,087 - 52,383, e.g. Corbet et al., 2008)
Note that the source also shows 404 days periodicity (Masetti et al. 2002, Galloway et al. 2002, Corbet et al. 2008) and the previous flux peak (~30 mCrab) was observed around MJD 56200 with MAXI.
The public light curves and products can be seen at
http://maxi.riken.jp/top/index.php?cid=1&jname=J1706+239 .
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