MAXI/GSC detected a renewed X-ray activity from GX 304-1

ATel #3309; T. Yamamoto, T. Mihara, M. Sugizaki (RIKEN), M. Nakajima (Nihon U.), M. Serino, S. Nakahira, T. Sootome, M. Matsuoka (RIKEN), S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA), N. Kawai, M. Morii, K. Sugimori, R. Usui, T. Toizumi (Tokyo Tech), A. Yoshida, K. Yamaoka (AGU), H. Tsunemi, M. Kimura, H. Kitayama (Osaka U.), H. Negoro, F. Suwa (Nihon U.), Y. Ueda, K. Hiroi, M. Shidatsu (Kyoto U.), Y. Tsuboi, T. Matsumura, K. Yamazaki (Chuo U.) report on behalf of the MAXI team
on 28 Apr 2011; 06:31 UT
Credential Certification: Tatehiro Mihara (mihara@crab.riken.jp)

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The MAXI/GSC detected a renewed activity from a Be/X-ray binary pulsar, GX 304-1 on 2011 April 25 (MJD 55676.5). The source flux reached 84+-5 mCrab in 2-20 keV on April 25. The event is consistent with the recurrent outburst by the 132.5-day orbital period from the last one (ATel #3075) and corresponds to the seventh of successive outbursts since the source activity resumed on 2008 June following the 28-year absence (ATel #1613). The outburst peak is expected to come on May 6. 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