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MAXI/GSC detection of a bright X-ray flare from Mrk 421

ATEL # 2444; N. Isobe (Kyoto U.), H. Negoro (Nihon U.), M. Matsuoka, K. Kawasaki, S. Ueno, H. Tomida, M. Suzuki, M. Ishikawa (JAXA), T. Mihara, M. Sugizaki, M. Kohama, Y.E. Nakagawa, T. Yamamoto, T. Saotome (RIKEN), N. Kawai, M. Morii, K. Sugimori (Tokyo Tech), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura (Osaka U.), M. Nakajima, S. Miyoshi, H. Ozawa, R. Ishiwata (Nihon U.), Y. Ueda, S. Eguchi, K. Hiroi (Kyoto U.), A. Daikyuji (Miyazaki U.), A. Uzawa, T. Matsumura, K. Yamazaki (Chuo U.) on behalf of the MAXI team
on 18 Feb 2010; 3:38 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Nobuyuki Kawai (nkawai@phys.titech.ac.jp)

Subjects: X-ray, AGN, Transients

MAXI/GSC has detected a bright X-ray flare from a BL Lac object Mrk 421. Its X-ray flux increased to 156 +- 11 mCrab (1.5 - 10 keV) on 2010 February 16 (mid MJD = 55243.5) from <30 mCrab on 2010 February 14. The current flux is higher than that in the recent bright X-ray flare reported by MAXI on 2010 January 01 (116 +- 10 mCrab, ATEL #2368). Multiwavelength observations of this source are encouraged.
The latest light curve and image of this source are available at the following URL: http://maxi.riken.jp/sourcelist.html.

MAXI/GSC light curves


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R. E. Rutledge , Editor
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