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The state transition of Cyg X-3: MAXI/GSC data

ATel #3139; T. Kotani (AGU), S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA), T. Mihara, Y. E. Nakagawa, M. Sugizaki, M. Serino, T. Yamamoto, T. Sootome, M. Matsuoka (RIKEN), N. Kawai, M. Morii, K. Sugimori, R. Usui (Tokyo Tech), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura, H. Kitayama (Osaka U.), H. Negoro, M. Nakajima, H. Ozawa, F. Suwa (Nihon U.), Y. Ueda, N. Isobe, S. Eguchi, K. Hiroi, M. Shidatsu (Kyoto U.), A. Daikyuji (Miyazaki U.), Y. Tsuboi, A. Uzawa, T. Matsumura, K. Yamazaki (Chuo U.) report on behalf of the MAXI team:
on 1 Feb 2011; 09:46 UT
Credential Certification: T. Kotani (kotani@hp.phys.titech.ac.jp)

Subjects: Radio, Millimeter, X-ray, >GeV, Binary

Referred to by ATel #: 3233

The daily light curve of Cyg X-3 taken with MAXI/GSC shows that the hard (10 keV-20 keV) X-ray flux is at an unusually low level since 2011/01/25 (UT) (MJD=55586), while the soft (1.5 keV-10 keV) X-ray remains as highly active as 300 mCrab. The sudden decrease in the hard X-ray band by a factor of 1/4 coincides the occurrence of a millimeter-wave radio flare (ATel #3130). These observations suggests that Cyg X-3 enters the new state in which the soft X-ray and millimeter flux are active but the hard X-ray is suppressed. It should be noted that the gamma-ray and radio flares have been observed following similar state transitions (Tavani et al. 2009 Nature 462, 620; Abdo et al. 2009 Science 326, 1512; ATel #2635, #2644, #2646). Multi-wavelength follow-up observations are encouraged, although the activity at lower radio frequencies may take a time to become observable (ATel #3135). The MAXI/GSC light curve and image are updated daily at the following URL: http://maxi.riken.jp/top/index.php?cid=1&jname=J2032+409