MAXI/GSC detects the onset of a recurrent outburst of GX 304-1

ATel #3856; T. Yamamoto (RIKEN), H. Tomida (JAXA), T. Mihara, M. Sugizaki, M. Serino, S. Nakahira, T. Sootome, M. Matsuoka (RIKEN), S. Ueno, 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.), H. Negoro, M. Nakajima, F. Suwa, M. Asada, H. Sakakibara (Nihon 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 10 Jan 2012; 14:10 UT
Credential Certification: Tatehiro Mihara (mihara@crab.riken.jp)

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MAXI/GSC detected an increase in X-ray flux from a Be/X-ray binary pulsar GX 304-1 on 2012 Jan 8 (MJD 55934.5). The source flux reached 23+-5 mCrab in 4-10 keV on Jan 8. This event is consistent with the onset of the recurrent outburst with the 132.5-day period (ATel #3624), the tenth of the successive outbursts since the source activity resumed on 2008 Jun following the 28-year absence (ATel #1613). This activity occurred a same timing and a similar flux with the previous onset. The latest light curve and the image of this source are available at the following URL: http://maxi.riken.jp/top/index.php?cid=1&jname=J1301-616