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MAXI/GSC detection of a rapid X-ray brightening from Mrk 421

ATel #11186; Y. Tachibana (Tokyo Tech), Y. Ueda (Kyoto U.), H. Negoro (Nihon U.), S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai (JAXA), T. Mihara, M. Sugizaki, S. Nakahira, W. Iwakiri, M. Shidatsu, F. Yatabe, Y. Takao, M. Matsuoka (RIKEN), N. Kawai, S. Sugita, T. Yoshii, S. Harita, Y. Muraki, K. Morita (Tokyo Tech), A. Yoshida, T. Sakamoto, M. Serino, Y. Kawakubo, Y. Kitaoka, T. Hashimoto (AGU), H. Tsunemi, T. Yoneyama (Osaka U.), M. Nakajima, T. Kawase, A. Sakamaki (Nihon U.), T. Hori, A. Tanimoto, S. Oda, T. Morita, S. Yamada (Kyoto U.), Y. Tsuboi, Y. Nakamura, R. Sasaki, H. Kawai, T. Sato (Chuo U.), M. Yamauchi, C. Hanyu, K, Hidaka (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.)
on 17 Jan 2018; 14:17 UT
Credential Certification: Yutaro Tachibana (tachibana@hp.phys.titech.ac.jp )

Subjects: X-ray, AGN, Blazar

Referred to by ATel #: 11194, 11199

MAXI/GSC is detecting a bright X-ray flare from the BL Lac object Mrk 421.
The MAXI daily fluxes for the last 5 days are following:

MJD   2-4 keV (mCrab)   4-10 keV (mCrab)
58131   53 +- 5   52 +- 6
58132   34 +- 5   29 +- 5
58133   56 +- 5   53 +- 6
58134   91 +- 7   98 +- 7
58135   106 +- 8   124 +- 9

The current flux is comparable with the peak daily flux in the brightest X-ray flare from this object ever since the beginning of the MAXI observation (156 +- 11 mCrab in 1.5-10 keV on 2010 February 16, ATEL #2444; Isobe et al. 2010 PASJ 52, L55), and the X-ray brightening is still ongoing. Prompt multi-wavelength observations of the source are strongly encouraged.
The MAXI light curve of the source is available at the following URL:
MAXI/GSC light curve