MAXI/GSC detection of a new X-ray outburst from SAX J1808.4-3658
ATel #15563; Y. Imai (Tokyo Tech), M. Serino (AGU), H. Negoro, M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima (Nihon U.), T. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, 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, 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), M. Sugizaki (NAOC)
on 21 Aug 2022; 12:06 UT
Credential Certification: Motoko Suzuki (motoko@crab.riken.jp)
Subjects: X-ray, Neutron Star, Pulsar
At 03:18 on 2022 August 19, the MAXI/GSC nova-alert system triggered on
a faint X-ray transient at (R.A., Dec.) = (271.942, -36.461) (J2000),
which is at about 0.54 degree from a known X-ray source SAX J1808.4-3658.
The observed flux in 2-20 keV increased from August 18 and the outburst was
confirmed by NICER (ATel #15559). The one day average flux on August 19
was about 17 +- 5 mCrab in the same energy band.
MAXI/GSC detected the outbursts from the source in November 2011 (ATel #3733),
April 2015 (ATel #7364), and 2019 July (ATel #12993).
