{
  "bibcode": "2020GCN.27418....1Y",
  "body": "S. Yamada (Kyoto U.), H. Negoro, M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi, \nR. Takagi (Nihon U.), T. Mihara, C. Guo, Y. Zhou, T. Tamagawa, M. Matsuoka (RIKEN), \nT. Sakamoto, M. Serino, S. Sugita, H. Nishida, A. Yoshida (AGU), \nY. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.), M. Shidatsu (Ehime U.),\nN. Kawai, M. Oeda, K. Shiraishi, R. Adachi, M. Niwano (Tokyo Tech), \nS. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, R. Shimomukai, M. Tominaga (JAXA), \nY. Ueda, A. Tanimoto, S. Ogawa, K. Setoguchi, T. Yoshitake (Kyoto U.), \nH. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.), \nM. Yamauchi, S. Iwahori, Y. Kurihara, K. Kurogi, K. Miike (Miyazaki U.), \nT. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC) \nreport on behalf of the MAXI team:\n\nThe MAXI/GSC nova alert system triggered on a bright uncatalogued X-ray transient source \nat 13:12:27 UT on 2020 March 20. Assuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (125.923 deg, -75.733 deg) = (08 23 41, -75 43 58) (J2000) \nwith a statistical 90% C.L. elliptical error region \nwith long and short radii of 0.68 deg and 0.65 deg, respectively. \nThe roll angle of the long axis from the north direction is 59.0 deg counterclockwise. \nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 65 +- 22 mCrab\n(4.0-10.0keV, 1 sigma error).\nWithout the assumption on the source constancy, we obtain a rectangular error\nbox for the transient source with the following corners:\n(R.A., Dec) = (129.795, -77.155) deg = (08 39 10, -77 09 18) (J2000)\n(R.A., Dec) = (132.879, -76.048) deg = (08 51 30, -76 02 52) (J2000)\n(R.A., Dec) = (123.641, -74.339) deg = (08 14 33, -74 20 20) (J2000)\n(R.A., Dec) = (120.277, -75.319) deg = (08 01 06, -75 19 08) (J2000)\n\nIn the previous transit at 10:05 UT, a weak (30 +- 16 mCrab at 4-10 keV) enhancement \nwas also recognized. There was no significant excess flux in the next transit \nat 14:45 UT with an upper limit of 20 mCrab.\n\nFinally, we note that due to the poor statistics, we can not confirm that this event is a GRB.\nTherefore, we also name the source MAXI J0823-757.",
  "circularId": 27418,
  "createdOn": 1584800003000,
  "email": "negoro.hitoshi@nihon-u.ac.jp",
  "subject": "GRB 200320B: MAXI/GSC detection",
  "submitter": "Hitoshi Negoro at Nihon U  <negoro.hitoshi@nihon-u.ac.jp>",
  "eventId": "GRB 200320B"
}