MAXI/GSC detected a high state on an RS CVn star GT Mus
ATel #9251; R. Sasaki, Y. Nakamura, Y. Tsuboi (Chuo U.), S. Nakahira (JAXA), H. Negoro (Nihon U.), S. Ueno, H. Tomida, S. Nakahira, M. Ishikawa, Y. E. Nakagawa, Y. Sugawara (JAXA), T. Mihara, M. Sugizaki, M. Serino, W. Iwakiri, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), N. Kawai, N. Isobe, S. Sugita, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, Y. Kitaoka (AGU), H. Tsunemi, R. Shomura (Osaka U.), M. Nakajima, K. Tanaka, T. Masumitsu, T. Kawase (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori, A. Tanimoto (Kyoto U.), M. Yamauchi, K. Furuya (Miyazaki U.), K. Yamaoka (Nagoya U.)
on 17 Jul 2016; 12:40 UT
Credential Certification: Yohko Tsuboi (tsuboi@phys.chuo-u.ac.jp)
Subjects: X-ray, Binary, Star, Transient, Variables
Referred to by ATel #: 9255
At 2016-07-16 19:18 UT , the MAXI/GSC nova alert system triggered on a bright source at a position consistent with that of an RS CVn star GT Mus. The flux increased from 2016-07-16 13:08:30 UT to 2016-07-16 19:18 UT (the trigger time). The flux at 2016-07-16 19:18 UT is 150+-20 mCrab (90% error) in 4-10 keV band, corresponding to a luminosity of 1e34 ergs/s for an assumed distance of 172 pc. No decay is yet detected until 2016-07-17 06:07 UT. The observed flux is the highest among those in flares detected with the MAXI/GSC (e.g. Kanetou et al. 2015, ATEL#8285).
The position was determined from the data at 2016-07-16 20:51:30 UT, as (R.A., Dec) = (174.992 deg, -65.461 deg) = (11 39 58, -65 27 39) (J2000) with a statistical 90% C.L. circle error region with radii of 0.37 deg. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). This position is consistent with that of an GT Mus. No other source is listed in the ROSAT Bright Source Catalog in this error region.
