MAXI/GSC detects X-ray brightening of Mrk 501.

ATel #3752; T. Sootome, M. Sugizaki, T. Mihara, M. Serino, S. Nakahira, T. Yamamoto, M. Matsuoka (RIKEN), N. Kawai, M. Morii, K. Sugimori, R. Usui, T. Toizumi (Tokyo Tech), H. Negoro, M. Nakajima, F. Suwa (Nihon U.), S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA), A. Yoshida, K. Yamaoka (AGU), H. Tsunemi, M. Kimura, H. Kitayama (Osaka U.), Y. Ueda, K. Hiroi, M. Shidatsu (Kyoto U.), Y. Tsuboi, T. Matsumura, K. Yamazaki (Chuo U.) report on behalf of the MAXI team:
on 9 Nov 2011; 15:35 UT
Credential Certification: Mutsumi Sugizaki (sugizaki@riken.jp)

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MAXI/GSC detected X-ray brightening of Mrk 501. The daily-average flux monitored by MAXI/GSC all-sky survey in 2-10 keV band has been gradually increasing since 2011 November 1 (MJD=55866) with some variations, as listed below. The fluxes in the latest few days are at around 10 mCrab. It is remarkably higher than the value in the MAXI/GSC first catalogue, 2.6+-0.2 mCrab, obtained for the first 7 months from 2009 September to 2010 March (Hiroi et al. http://arxiv.org/abs/1108.5516 ) and almost comparable with that in the active period from 1997 to 1999 (Xue and Cui, 2005, ApJ, vol.622, p160).
Multiwavelength observations of this source are encouraged.
The latest MAXI/GSC light curve and image of the source are available at the following URL: http://maxi.riken.jp/top/index.php?cid=1&jname=J1653+397

 
UT    MJD    flux(mCrab)  1-sigma statistical error. 
11/1  55866  10.1          2.4 
11/2  55867   8.4          2.4 
11/3  55868   5.2          2.2 
11/4  55869   9.1          2.2 
11/5  55870  11.6          2.2 
11/6  55871  12.5          2.2 
11/7  55872   8.7          2.1 
11/8  55873  14.3          2.3