MAXI/GSC detection of brightening of a transient LMXB 4U1608-52

ATel #3237; M. Suguzaki(RIKEN), H. Negoro(Nihon U.), N. Kawai(Tokyo Tech), S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA), T. Mihara, Y. E. Nakagawa, M. Serino, T. Yamamoto, T. Sootome, M. Matsuoka, S. Ishikawa (RIKEN), M. Morii, K. Sugimori, R. Usui, T. Toizumi (Tokyo Tech), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura, H. Kitayama (Osaka U.), M. Nakajima, H. Ozawa, F. Suwa (Nihon U.), Y. Ueda, N. Isobe, S. Eguchi, K. Hiroi, M. Shidatsu (Kyoto U.), A. Daikyuji (Miyazaki U.), Y. Tsuboi, A. Uzawa, T. Matsumura, K. Yamazaki (Chuo U.) report on behalf of the MAXI team
on 26 Mar 2011; 04:18 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Nobuyuki Kawai (nkawai@phys.titech.ac.jp)

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MAXI/GSC detected X-ray brightening of a LMXB, 4U1608-52. The source flux began to increase steeply on 2011 March 24.0 (MJD=55644.0), and reached about 0.5 Crab (4-10 keV) on 2011 March 25 (MJD 55645). It indicates that the source has entered a new active state. Swift/BAT also detected the beginning of this outburst on March 23 (http://swift.gsfc.nasa.gov/docs/swift/results/transients/H1608-522/). The latest flux on March 26.0, ~ 0.8 Crab (4-10 keV), is comparable to the maximum flux in the last outburst observed in 2010 March (ATEL #2462). The latest light curve and image will be placed at the following URL: http://maxi.riken.jp/top/index.php?cid=1&jname=J1612-524

4U1608-52 MAXI/GSC Light Curve