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MAXI/GSC detection of X-ray outburst from the Be/X-ray binary pulsar A0535+26

ATel #6569; M. Nakajima (Nihon U.), T. Sakamoto (AGU), T. Mihara (RIKEN), Y. Ueda (Kyoto U.), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), M. Sugizaki, M. Morii, M. Serino, J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN), N. Kawai, T. Yoshii, Y. Tachibana (Tokyo Tech), A. Yoshida, H. Ohtsuki, Y. Kawakubo (AGU), H. Tsunemi, D. Uchida (Osaka U.), H. Negoro, K. Fukushima, T. Onodera, K. Suzuki, T. Namba, M. Fujita, F. Honda (Nihon U.), M. Shidatsu, T. Kawamuro, T. Hori (Kyoto U.), Y. Tsuboi, A. Kawagoe (Chuo U.), M. Yamauchi, Y. Morooka (Miyazaki U.), K. Yamaoka (Nagoya U.) report on behalf of the MAXI team:
on 13 Oct 2014; 15:19 UT
Credential Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)

Subjects: X-ray, Binary, Neutron Star, Transient, Pulsar

Referred to by ATel #: 7015, 12092, 14157, 14392

The MAXI/GSC nova alert system detected an X-ray flux increase from the Be/X-ray binary pulsar A0535+26 on MJD 56937. Using the orbital ephemeris (T_0=44943.5(MJD), Porb=111.0 d ; Giovannelli et al. 2013), the trigger date is consistent with the 0.05 orbital phase. On the basis of the MAXI on-demand analysis, we estimate that the daily-averaged X-ray flux in the 4-10 keV band was 13 +- 7 mCrab on MJD 56936 and increased to 49 +- 9 mCrab on MJD 56940. This brightening is also seen in the 15-50 keV light curve of the Swift/BAT hard X-ray transient monitor. The timing of the current X-ray outburst episode matched nicely to the prediction based on the optical observation (Atel #6528). According to this report, the expected peak intensity is about 10-100 mCrab which shows a good agreement with our MAXI observation. The derived orbital phase and the observed flux indicates that this outburst is a typical normal outburst. The latest light curve can be checked at the following page;
http://maxi.riken.jp/top/index.php?cid=1&jname=J0538+263