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MAXI/GSC detects an X-ray outburst of RX J1709.5-2639 (XTE J1709-267)

ATEL # 2729; H. Negoro (Nihon U.), M. Sugizaki (RIKEN), H. Tomida, K. Kawasaki, S. Ueno, M. Kohama, M. Ishikawa (JAXA), T. Mihara, Y.E. Nakagawa, M. Suzuki, T. Yamamoto, T. Sootome, M. Matsuoka (RIKEN), N. Kawai, M. Morii, K. Sugimori (Tokyo Tech), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura (Osaka U.), 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 10 Jul 2010; 6:26 UT
Password Certification: Hitoshi Negoro (

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

MAXI/GSC detects a new outburst of an X-ray source at a position consistent with a recurrent soft X-ray transient RX J1709.5-2639 (1RXS J170930.2-263927, XTE J1709-267). The 2-10 keV X-ray flux increased since around 2010 July 2 (UT), and reached to 84+-5 mCrab on 2010 July 8. These results are similar to those obtained during the latest outburst of RX J1709.5-2639 in Nov. 2007 (ATel #1302, also see ATel #255), and the interval between the outbursts is also consistent with the 2-3 year recurrence time of this transient source (ATel #1302). A preliminary spectral fit to the data on July 7.7-9.4 with an absorbed power-law model gives a photon index of about 3, which is also consistent with RXTE/PCA results of RX J1709.5-2639 in outburst in 1997 (Marshall et al. IAUC 6543). The latest light curve and the image of this source are available at the following URL:

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R. E. Rutledge , Editor
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