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MAXI/GSC detection of a possible X-ray flare from an RS CVn star GT Mus (=4U1137-65, HD 101379)

ATEL # 3021; M. Nakajima, F. Suwa, H. Negoro, H. Ozawa (Nihon U.), T. Matsumura, K. Yamazaki, A. Uzawa (Chuo U.), N. Kawai (Tokyo Tech), T. Mihara, M. Serino, M. Sugizaki, Y.E. Nakagawa, T. Yamamoto, T. Sootome, M. Matsuoka (RIKEN), M. Morii, K. Sugimori, R. Usui (Tokyo Tech), S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA), A. Yoshida, K. Yamaoka, S. Nakahira (AGU), H. Tsunemi, M. Kimura (Osaka U.), Y. Ueda, N. Isobe, S. Eguchi, K. Hiroi, M. Shidatsu (Kyoto U.), A. Daikyuji (Miyazaki U.) report on behalf of the MAXI team
on 10 Nov 2010; 13:08 UT
Password Certification: Hitoshi Negoro (

Subjects: X-ray, Cataclysmic Variables, Variables, Stars
Referred to by ATEL #: 3025

On 2010-11-10 06:17:27 UT (= MJD 55510.26211), the MAXI/GSC transient alert system triggered on enhanced X-ray emission from the position:

(R.A., Dec) = (174.925, 65.498) = (11h 39m 42s, -65d 29m 53s) (J2000)

with an error radius (statistical + systematic) of about 0.3 degrees. This location is consistent with that of the RS CVn star GT Mus (=4U 1137-65, HD 101379) (Garcia et al. 1980, ApJ 240, L107) :

(R.A., Dec) = (174.873, -65.398) = (11h 39m 29.593s, -65d 23m 51.96s) (J2000)

The 4-10 keV source flux has started to increase from around MJD 55509.5, and once reached a peak at about 40 mCrab on MJD 55509.610. The source flux is increasing again, and about 50 mCrab at MJD 551510.5.

We encourage the follow-up multi-wavelength observation. The MAXI/GSC will continue to monitor this source. The MAXI/GSC light curve and image are available at the following URL:


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R. E. Rutledge , Editor
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