{
  "bibcode": "2022GCN.32630....1S",
  "body": "Y. Soejima, H. Negoro, M. Nakajima (Nihon U.), M. Serino (AGU), \nW. Iwakiri (Chuo. U.), K. Kobayashi, M. Tanaka (Nihon U.), \nT. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN), \nT. Sakamoto, S. Sugita, H. Hiramatsu, A. Yoshida (AGU), \nY. Tsuboi, J. Kohara (Chuo U.),  M. Shidatsu, M. Iwasaki (Ehime U.),\nN. Kawai, M. Niwano, R. Hosokawa, Y. Imai, N. Ito, Y. Takamatsu (Tokyo Tech), \nS. Nakahira,  S. Ueno, H. Tomida, M. Ishikawa,  T. Kurihara (JAXA), \nY. Ueda, S. Ogawa, K. Setoguchi, T. Yoshitake, K. Inaba (Kyoto U.), \nM. Yamauchi, T. Sato, R. Hatsuda, R. Fukuoka, Y. Hagiwara, Y. Umeki (Miyazaki U.), \nK. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC) \nreport on behalf of the MAXI team:\n\nThe MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 2022-10-08T00:53:50 UT.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (29.687 deg, -18.876 deg) = (01 58 44, -18 52 33) (J2000)\nwith a statistical 90% C.L. elliptical error region\nwith long and short radii of 0.12 deg and 0.09 deg, respectively.\nThe roll angle of long axis from the north direction is 25.0 deg counterclockwise.\nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nWithout assumptions on the source constancy, we obtain a rectangular error\nbox for the transient source with the following corners:\n(29.400, -18.665) deg = (01 57 35, -18 39 53) (J2000)\n(29.338, -18.887) deg = (01 57 21, -18 53 13) (J2000)\n(30.076, -19.070) deg = (02 00 18, -19 04 12) (J2000)\n(30.137, -18.847) deg = (02 00 32, -18 50 49) (J2000)\nThe X-ray flux averaged over the scan was 803 +- 56 mCrab\n(4.0-10.0keV, 1 sigma error).\nThere was no significant excess flux in the previous transit at 10/07 23:21 UT\n with an upper limit of 20 mCrab.",
  "circularId": 32630,
  "createdOn": 1665194423000,
  "email": "negoro.hitoshi@nihon-u.ac.jp",
  "subject": "GRB 221008A: MAXI/GSC detection",
  "submitter": "Hitoshi Negoro at Nihon U  <negoro.hitoshi@nihon-u.ac.jp>",
  "eventId": "GRB 221008A"
}