MAXI/GSC detection of a new outburst from SAX J1810.8-2609
ATel #14649; W. Iwakiri (Chuo Univ), H. Negoro, M. Nakajima, Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, K. Komachi, A. Yoshida (AGU), Y. Tsuboi, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, M. Niwano, R. Hosokawa (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, Y. Goto, R. Uematsu (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, Y. Nonaka, T. Sato, R. Hatsuda, R. Fukuoka (Miyazaki U.), T. Kawamuro (UDP/NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC) report on behalf of the MAXI team:
on 21 May 2021; 00:16 UT
Credential Certification: Wataru Iwakiri (wataru.iwakiri@riken.jp)
Subjects: X-ray, Neutron Star, Transient
Referred to by ATel #: 14659
MAXI/GSC detected a new X-ray outburst from NS-LMXB SAX J1810.8-2609 on 2021 May 13 (MJD 59347). The X-ray flux is increasing slowly and the averaged X-ray flux in the 2 - 10 keV band during May 17 to 19 reaches 7.7 +/- 1.4 x 10-10 erg/s/cm2, which corresponds to the X-ray luminosity of 2.2 +/- 0.4 x 1036 erg/s assuming the distance of 4.9 kpc (Natalucci et al. 2000, ApJ, 536, 891).
This is the fourth outburst from SAX J1810.8-2609 detected by MAXI (ATel#11593, although the third one is a marginal detection). Since this outburst is also seen in the Swift/BAT lightcurve, the spectrum may be harder than the outbursts detected by MAXI in the past.
MAXI data for SAX J1810.8-2609
