{
  "bibcode": "2021GCN.29543....1N",
  "body": "M. Nakajima (Nihon U.), M. Serino (AGU), Y. Kawakubo (LSU),\nH. Negoro, M. Aoki, K. Kobayashi, R. Takagi, K. Asakura, K. Seino (Nihon U.),\nT. Mihara, T. Tamagawa, M. Matsuoka (RIKEN),\nT. Sakamoto, S. Sugita, H. Nishida, K. Komachi, A. Yoshida (AGU),\nY. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.),\nM. Shidatsu (Ehime U.),\nN. Kawai, R. Adachi, M. Niwano, R. Hosokawa (Tokyo Tech),\nS. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka (JAXA),\nY. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, Y. Goto, R. Uematsu (Kyoto U.),\nH. Tsunemi (Osaka U.),\nM. Yamauchi, K. Kurogi, K. Miike (Miyazaki U.),\nT. Kawamuro (UDP/NAOJ),\nK. Yamaoka (Nagoya U.),\nM. Sugizaki (NAOC)\nreport on behalf of the MAXI team:\n\nThe MAXI/GSC nova alert system triggered a bright uncatalogued X-ray \ntransient source at 2021-02-22T15:59:19 UT.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (353.129 deg, -29.464 deg) = (23 32 30, -29 27 50) (J2000)\nwith a statistical 90% C.L. elliptical error region\nwith long and short radii of 0.11 deg and 0.04 deg, respectively.\nThe roll angle of long axis from the north direction is 90.0 deg counterclockwise.\nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 389 +- 38 mCrab\n(4.0-10.0keV, 1 sigma error).\nThere was no significant excess flux in the previous transit at 14:26 UT\nwith an upper limit of 20 mCrab.",
  "circularId": 29543,
  "createdOn": 1614025081000,
  "email": "motoko@crab.riken.jp",
  "subject": "GRB 210222A: MAXI/GSC detection",
  "submitter": "Motoko Serino at RIKEN/MAXI  <motoko@crab.riken.jp>",
  "eventId": "GRB 210222A"
}