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MAXI/GSC reports the highest soft X-ray flux from the blazer 1ES 1959+650

ATel #8165; H. Negoro (Nihon U.), T. Fujiwara (Tokyo Tech), S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), T. Mihara, M. Sugizaki, M. Serino, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), N. Kawai, M. Arimoto, T. Yoshii, Y. Tachibana, Y. Ono (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), H. Tsunemi, R. Imatani (Osaka U.), M. Nakajima, K. Tanaka, T. Masumitsu (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori (Kyoto U.), Y. Tsuboi, S. Kanetou (Chuo U.), M. Yamauchi, D. Itoh (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Morii (ISM), on behalf of the MAXI team
on 14 Oct 2015; 14:09 UT
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)

Subjects: X-ray, Blazar

Referred to by ATel #: 8193, 9148

On 2015 October 11, the MAXI/GSC nova alert system triggered enhancement of the soft X-ray emission from the blazer 1ES 1959+650, which recently showed a bright flare in very-high-energy gamma-rays on October 8 to 9 (Mukherjee ATel #8148). The 2-4 keV and 4-10 keV fluxes averaged over recent 2 days from October 12 to 13 are 0.024 +/- 0.006 photons/cm2/s (~14 mCrab) and 0.018 +/- 0.005 photons/cm2/s (~15 mCrab), respectively.

This source has been detected with the MAXI/GSC since the beginning of the mission, 2009 August. X-ray light curves show relatively large time variations on timescales of days to months. This enhanced fluxes are the highest level ever observed in this source by MAXI, and similar high fluxes were observed, for instance, in 2010 October and 2013 December.

MAXI public archive for 1ES 1959+650