MAXI/GSC detection of an outburst of an X-ray source in M15 following a bright X-ray burst
ATel #5327; H. Tomida, S. Ueno (JAXA), H. Negoro (Nihon U.) M. Serino, T. Mihara, M. Sugizaki, M. Morii, T. Yamamoto, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN),S. Nakahira, M. Kimura, M. Ishikawa, Y. Nakagawa (JAXA), N. Kawai, R. Usui, K. Ishikawa, T. Yoshii (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Nakano, Y. Kawakubo (AGU), H. Tsunemi, M. Sasaki (Osaka U.),M. Nakajima, K. Fukushima, T. Onodera, K. Suzuki (Nihon U.), Y. Ueda, M. Shidatsu, T. Kawamuro (Kyoto U.), Y. Tsuboi, M. Higa (Chuo U.), M. Yamauchi, K. Yoshidome, H. Yamada, Y. Ogawa (Miyazaki U.), K. Yamaoka (Nagoya U.) report on behalf of the MAXI team
on 27 Aug 2013; 05:02 UT
Credential Certification: Hiroshi Tomida (tomida.hiroshi@jaxa.jp)
Subjects: X-ray, Binary, Globular Cluster, Transient, Variables
The MAXI/GSC has detected an X-ray outburst from the position consistent with that of the globular cluster M15. This episode started at around the time when a bright type-I X-ray burst was detected in a scan transit at 05:52 on July 20th, 2013 (MJD 56493.2444).
The burst flux averaged over the scan transit was 1,080 +- 34 mCrab in the 4-10 keV band, corresponding to the 4-10 keV luminosity of 2e38 erg/s assuming the source distance of 10.3 kpc.
The persistent X-ray flux from M 15 on the day the X-ray burst was ~10 mCrab.
Then the flux gradually increased to a one-day average flux on August 25th (MJD 56529) of 37+- 9 mCrab.
The X-ray burst and the following outburst is reminiscent of the outburst in May 16th, 2011 (ATel #3356). In 2011, the follow-up observations demonstrated that the outbursting source was the ultracompact X-ray binary M15 X-2 (ATel #3363, #3378, #3393).
This is the 3rd detection of outbursts from M15 with MAXI since August, 2009.
The daily light curve of M15 is available at the following URL:
http://maxi.riken.jp/top/index.php?cid=1&jname=J2129+121