MAXI/GSC detection of an X-ray flare from GT Mus on 2026-11-09 UT
ATel #18152; Y. Ishihara, H. Ogaki, Y. Tsuboi (Chuo U.), W. Iwakiri (Chiba U.), H. Negoro (Nihon U.), T. Kato (AGU), M. Nakajima, K. Saito, T. Yokoyama, M. Wada (Nihon U.), T. Mihara, A. Aoyama, M. Ota, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, H. Hiramatsu, A. Yoshida (AGU), M. Shidatsu, C. Kang, M. Uenishi, T. Usuki, S. Yatsuzuka, H. Aoe (Ehime U.), I. Takahashi, Y. Yatsu (Science Tokyo), S. Nakahira, S. Ueno, H. Tomida, M. Kurihara (JAXA), Y. Ueda, K. Fujiwara, S. Kobayashi (Kyoto U.), M. Yamauchi, M. Nishio, C. Hiraizumi (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Sugizaki (Kanazawa U.), T. Kawamuro (Osaka U.), S. Yamada (Tohoku U), S. Ogawa (TUS)
on 11 Nov 2026; 04:46 UT
Credential Certification: Yohko Tsuboi (tsuboi@phys.chuo-u.ac.jp)
Subjects: X-ray, Binary, Star, Transient, Variables
At 05:50 on 2026-11-09 UT, the MAXI/GSC nova alert system triggered on a source at a position consistent with that of the RS CVn star GT Mus.
The X-ray flux averaged over 22 scans was 5 (+0.8/-3) × 10-10 erg s-1 cm-2 (2-10 keV). Corresponding luminosity was 8 (+1/-4) × 1032 erg s-1 for an assumed distance of 110 pc.
The flux is still increasing at 01:04 on 2026-11-11 UT.
