MAXI/GSC detection of X-ray rebrightening of MAXI J1348-630
ATel #12838; H. Negoro (Nihon U.), T. Mihara (RIKEN), M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.), S. Nakahira, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, H. Nishida, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, M. Sugizaki, M. Oeda, K. Shiraishi (Tokyo Tech), S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai, M. Tominaga (JAXA), Y. Ueda, A. Tanimoto, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake (Kyoto U.), H. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.), M. Yamauchi, S. Iwahori, Y. Kurihara, K. Kurogi, K. Miike (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), and Y. Kawakubo (LSU)
on 5 Jun 2019; 03:43 UT
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
Subjects: X-ray, Black Hole, Transient
MAXI/GSC detected X-ray rebrightening of the black hole candidate MAXI J1358-630 (ATel #12425, 12430, 12434, 12439, 12441, 12447, 12448, 12456, 12457, 12470, 12477, 12480, 12491, 12497, 12505, 12520, 12829) on May 31, 2019, MJD 58634 (MAXI x-ray-star ML: No. 699). Since then, the 2-10 keV flux is almost linearly increasing and has reached about 200 mCrab on June 5. The hard X-ray flux above 15 keV obtained with Swift/BAT (https://swift.gsfc.nasa.gov/results/transients/weak/MAXIJ1348-630/) is, however, decreasing since June 3, suggesting that the source is undergoing a hard-to-soft state transition.
After the soft-to-hard transition around the end of April, the X-ray flux dropped relatively sharply. It had been below the one-day MAXI detection limit about 15 mCrab since May 11. It is interesting to note that prior to this X-ray rebrightening, the optical rebrightening was detected (Russell et al. ATel #12929).
Observations of rebrightening and state transitions for such a bright nova are useful to examine various critical mass accretion rates of the accretion disk with less uncertainty. Followup observations in multi-wavelengths are encouraged.
MAXI data for MAXI J1348-630
