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MAXI/GSC detects X-ray brightening of a symbiotic X-ray binary 4U 1954+319

ATEL # 2702; M. Sugizaki, T. Mihara, Y.E. Nakagawa, M. Suzuki, T. Sootome, T. Yamamoto, M. Matsuoka (RIKEN), K. Kawasaki, S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA), N. Kawai, M. Morii, K. Sugimori, R. Usui (Tokyo Tech), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura (Osaka U.), H. Negoro, M. Nakajima, H. Ozawa, F. Suwa (Nihon U.), Y. Ueda, N. Isobe, S. Eguchi, K. Hiroi (Kyoto U.), A. Daikyuji (Miyazaki U.), A. Uzawa, T. Matsumura, K. Yamazaki (Chuo U.) report on behalf of the MAXI team
on 29 Jun 2010; 4:33 UT
Password Certification: Mutsumi Sugizaki (sugizaki@riken.jp)

Subjects: X-ray, Binaries, Neutron Stars, Pulsars, Transients

MAXI/GSC has detected X-ray brightening of a symbiotic low-mass X-ray binary 4U 1954+319, since 2010 June 17 (UT). The source flux in 2--10 keV had been at a low level, about 13 mCrab on average and at most 50 mCrab since MAXI/GSC started monitoring on 2009 August 15. The X-ray flux from this source started to increase on 2010 June 17, then reached 71 +-4 mCrab on June 24, 65 +- 5 mCrab on June 25. It was 46 +- 5 mCrab on June 27. Multiwavelength observations are encouraged.

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=J1955+320


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R. E. Rutledge , Editor
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