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Re-brightening of GRO J1008-57 detected by MAXI/GSC: Third outburst in a single orbit

ATel #6819; M. Nakajima (Nihon U.), M. Sugizaki, T. Mihara (RIKEN), S. Nakahira, S. Ueno, H. Tomida, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), M. Morii, M. Serino, J. Sugimoto, T. Takagi, A. Yoshikawa, M. Matsuoka (RIKEN), N. Kawai, T. Yoshii, Y. Tachibana (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, D. Uchida (Osaka U.), H. Negoro, K. Fukushima, T. Onodera, K. Suzuki, T. Namba, 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.) report on behalf of the MAXI team:
on 14 Dec 2014; 03:11 UT
Credential Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)

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

Referred to by ATel #: 6823, 6917, 8547, 10529

The MAXI/GSC nova alert system detected an X-ray brightening from the Be/X-ray binary pulsar, GRO J1008-57, on 2014 December 10 (MJD 57001). According to ATEL #6465, #6630, #6656, #6664, the source had been in the double-peaked outburst near the periastron since 2014 September 2. The MAXI/GSC (http://maxi.riken.jp/top/index.php?cid=1&jname=J1009-582) and Swift/BAT (http://swift.gsfc.nasa.gov/results/transients/GROJ1008-57/) lightcurves show that the current brightening emerged when the outburst activity almost terminated. It can develop into the third outburst peak. Such a multiple-peak outburst has rarely observed, so far (e.g. A0535+26, XTE J1946+274 and GX304-1). Using the orbital ephemeris, T_0=54416.65 (MJD) and P_orb=249.48 d, given by Kühnel et al. 2013, the three peak onsets locate at 0.96, 0.16 and, 0.36 in orbital phase, respectively. Each brightening emerged at equal intervals.

We encouraged multi wavelength observations. The latest light curve and the image are available at the following URL:
http://maxi.riken.jp/top/index.php?cid=1&jname=J1009-582