MAXI/GSC detects a spectral state transition in H 1743-322
ATel #2378; K. Yamaoka (AGU), H. Negoro (Nihon U.), M. Sugizaki, T. Mihara, M. Kohama, Y. E. Nakagawa, T. Yamamoto (RIKEN), M. Matsuoka, K. Kawasaki, S. Ueno, H. Tomida, M. Suzuki, M. Ishikawa (JAXA), N. Kawai, M. Morii, K. Sugimori (Tokyo Tech.), A. Yoshida, 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.), and A. Daikyuji (Univ. of Miyazaki), on behalf of the MAXI team
on 9 Jan 2010; 09:20 UT
Credential Certification: Kazutaka Yamaoka (email@example.com)
Subjects: X-ray, Request for Observations, Binary, Black Hole, Transient
MAXI/GSC has observed further brightening of the black hole candidate
H 1743-322 in the current outburst (Yamaoka et al. ATEL #2364).
The X-ray flux in the 4-10 keV band has been increasing from 83 mCrab
on Jan. 3 (MJD 55199) to 180 mCrab on Jan. 7 (MJD 55203).
The GSC energy spectra are roughly described with a single power-law with
the absorption, and the photon index steepens from about 2.0
on Jan. 3 to about 3.1 on Jan. 7, suggesting that the source is just
during the spectral state transition from the low/hard state to
the very high or high/soft state. Further multi-wavelength
observations are strongly encouraged.
The MAXI/GSC light curve and image are updated daily at the following URL: http://maxi.riken.jp/sourcelist.html