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MAXI/GSC detects an increase in X-ray flux from 4U 1711-34

ATEL # 2425; H. Negoro (Nihon U.), M. Sugizaki, T. Yamamoto, T. Mihara, M. Kohama, Y.E. Nakagawa, T. Saotome (RIKEN), M. Matsuoka, K. Kawasaki, S. Ueno, H. Tomida, M. Suzuki, M. Ishikawa (JAXA), N. Kawai, M. Morii, K. Sugimori (Tokyo Tech.), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura (Osaka U.), M. Nakajima, R. Ishiwata, S. Miyoshi, H. Ozawa (Nihon U.), Y. Ueda, N. Isobe, S. Eguchi, K. Hiroi (Kyoto U.), A. Daikyuji (Univ. of Miyazaki), A. Uzawa, T. Matsumura, K. Yamazaki (Chuo U.) on behalf of the MAXI team.
on 6 Feb 2010; 12:20 UT
Password Certification: Mutsumi Sugizaki (

Subjects: X-ray, Request for Observations, Binaries, Neutron Stars, Transients

MAXI/GSC detected an outburst of a transient X-ray burster, 4U 1711-34 (=2S 1711-339), beginning from 2010-02-03 (MJD=55230). Observations of its previous outbursts in March 2004 (ATEL #255) and the potential quiescent counterpart (ATEL #233, #238, #244) were reported. The fluxes averaged per day in the 1.5-10 keV band were 7+-3 mCrab on 2010-02-03 and 18+-3.5 mCrab on 2010-02-04 (errors represent 1-sigma statistical uncertainty). It had been below the 4-sigma detection sensitivity limit of 10 mCrab per day until 2010-02-02. RXTE PCA Galactic Center observations also detected the increased flux on 2010-02-04 (ref. The MAXI lightcurve and image of the source are updated daily at the following URL:

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates