MAXI/GSC detection of a new X-ray outburst from the Galactic Center region
ATel #16059; 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 (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 (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 28 May 2023; 17:00 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Hitoshi Negoro (negoro@phys.cst.nihon-u.ac.jp)
Subjects: X-ray, Black Hole, Neutron Star, Transient
Referred to by ATel #: 16061
At 13:34 UT on 2023 May 24, the MAXI/GSC nova alert system triggered on X-ray enhancement from the Galactic Center region. Since then, the 2-10 X-ray flux has been increasing and reached about 100 mCrab on May 28. The GSC with a field of view of about 1.5 degree (FWHM) can not constrain the source position because many X-ray sources are located in the region. We then obtained a recent light curve of each bright X-ray source in the region by fitting GSC images with a point spread function of the GSC taking account of nearby sources. 1A 1742-294 (2E 1742.9-2929), SAX J1747.0-2853, and some possible candidates obtained by our localization software, however, did not show any significant enhancement except for the "Galactic Center region" source at (l, b) = (359.944, -0.046). We also note that because of poor statistics the possibility still can not be excluded that this flaring source is one of these examined sources. We tentatively name the source MAXI J1743-291.
Swift/XRT followup will be requested.
MAXI Galactic Center region
