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
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
