MAXI/GSC detection of a new X-ray outburst from GX 339-4

ATel #15577; K. Kobayashi, H. Negoro, M. Nakajima, M. Tanaka, Y. Soejima (Nihon U.), T. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, H. Hiramatsu, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, J. Kohara (Chuo U.), M. Shidatsu, M. Iwasaki (Ehime U.), N. Kawai, M. Niwano, R. Hosokawa, Y. Imai, N. Ito, Y. Takamatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, T. Kurihara (JAXA), Y. Ueda, S. Ogawa, K. Setoguchi, T. Yoshitake, K. Inaba (Kyoto U.), M. Yamauchi, T. Sato, R. Hatsuda, R. Fukuoka, Y. Hagiwara, Y. Umeki (Miyazaki U.), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), and M. Sugizaki (NAOC)
on 29 Aug 2022; 15:50 UT
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)

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The MAXI/GSC nova alert system triggered on a new X-ray activity from the black hole X-ray binary GX 339-4 at 9:25 UT on 2022 August 29. The 4-10 keV flux in the scan transits from 13:17 on August 28 to 10:58 on August 29 was almost constant at about 30 mCrab. Unfortunately, the source was in or near an undetectable area for the nova alert system from August 24 to August 28. The Swift/BAT hard X-ray monitor also shows a gradual increase in the 15-50 keV X-ray flux since around August 23.(https://swift.gsfc.nasa.gov/results/transients/weak/GX339-4/).
The previous outburst was first detected on 2021 January 4 with MeerKAT (Tremou et al. ATel #14336). Follow-up multi-wavelength observations are encouraged.

Trigger information about GX 339-4