MAXI/GSC detection of weak X-ray activity of GX 339-4
ATel #16302; H. Negoro, M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.), T. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU), Y. Tsuboi, S. Urabe, S. Nawa, N. Nemoto, E. Goto (Chuo U.), M. Shidatsu (Ehime U.), I. Takahashi, M. Niwano, S. Sato, N. Higuchi, Y. Yatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, T. Kurihara (JAXA), Y. Ueda, K. Setoguchi, T. Yoshitake, Y. Nakatani, Y. Okada (Kyoto U.), M. Yamauchi, Y. Hagiwara, Y. Umeki, Y. Otsuki (Miyazaki U.), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC), and W. Iwakiri (Chiba U.)
on 22 Oct 2023; 15:31 UT
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
Subjects: X-ray, Black Hole
The MAXI/GSC nova alert system triggered on weak X-ray activity of the black hole X-ray binary GX 339-4 at 04:00 (UT) on October 18, 2023. The source has been detectable since October 13, and after that no significant increase in X-ray flux is recognized. The 2-10 keV X-ray flux on October 21 was 0.033 +/- 0.007 photons/cm2/s (about 10 mCrab).
Optical and X-ray observations with the Las Cumbres Observatory network and the Swift/XRT showed an almost simultaneous increase in flux in September (Alabarta et al. ATel #16260). The X-ray flux on September 23 was below 1 mCrab. These data suggest this outburst is fainter than a weak outburst starting on August, 2022 (Kobayashi et al. ATel #15577).
MAXI/GSC data for GX 339-4
