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MAXI/GSC detected a new outburst of the Be/X-ray binary pulsar GRO J1008-57

ATel #3796; M. Shidatsu (Kyoto U.), S. Nakahira, Y. Yamamoto, T. Mihara (RIKEN), H. Negoro (Nihon U.), S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA), M. Sugizaki, M. Serino, T. Sootome, M. Matsuoka (RIKEN), 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.), M. Nakajima, F. Suwa, M. Asada, H. Sakakibara (Nihon U.), Y. Ueda, K. Hiroi (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 5 Dec 2011; 03:06 UT
Credential Certification: Satoshi NAKAHIRA (nakahira@crab.riken.jp)

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

Referred to by ATel #: 3805, 4759, 7490

We report on the increase of X-ray flux of the Be/X-ray binary pulsar GRO J1008-57 observed with MAXI/GSC. The 4-10 keV X-ray flux was 9.9 ± 2.6 mCrab in the one-day average on December 5, 2011 (MJD 55899). The previous one-day fluxes were < 2.5 mCrab (Dec.2), 5,2 ± 2.6 mCrab (Dec.3), and 10 ± 2.8 mCrab (Dec.4). This activity is expected from its regular outburst with the 247.8 day orbital period (Coe et al. 2007, MNRAS, 378, 1427 ), following the last one detected in April 2011 (Atel #3254). The lightcurves of previous outbursts predict the peak of the outburst to be around Dec.16, 2011.
The latest light curve and the image of this source are available at http://maxi.riken.jp/top/index.php?cid=1&jname=J1009-582 .