{
  "bibcode": "2019GCN.25262....1S",
  "body": "T. Sato (Chuo U.), H. Negoro, M. Nakajima, W. Maruyama, M. Aoki, \nK. Kobayashi (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), \nT. Sakamoto, M. Serino, S. Sugita, H. Nishida, A. Yoshida (AGU), \nY. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai (Chuo U.),  M. Shidatsu (Ehime U.),\nN. Kawai, M. Sugizaki, M. Oeda, K. Shiraishi (Tokyo Tech), S. Nakahira, Y. Sugawara, \nS. Ueno, H. Tomida, M. Ishikawa, N.Isobe, R. Shimomukai, M. Tominaga (JAXA), \nY. Ueda, A. Tanimoto, S. Yamada, 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)\nreport on behalf of the MAXI team:\n\nThe MAXI/GSC nova alert system triggered on an uncatalogued X-ray transient source at \n07:58:15 UT on  2019 August 04.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (239.895 deg, -44.773 deg) = (15 59 34, -44 46 22) (J2000) \nwith a statistical 90% C.L. elliptical error region \nwith long and short radii of 0.29 deg and 0.24 deg, respectively. \nThe roll angle of the long axis from the north direction is 39.0 deg counterclockwise. \nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 118 +- 21 mCrab\n(4.0-10.0keV, 1 sigma error).\n\nWithout assumptions on the source constancy,we obtain a rectangular error\nbox for the transient source with the following corners:\n(R.A., Dec) = (240.071, -43.705) deg = (16 00 17, -43 42 17) (J2000)\n(R.A., Dec) = (239.431, -43.730) deg = (15 57 43, -43 43 47) (J2000)\n(R.A., Dec) = (239.594, -45.994) deg = (15 58 22, -45 59 38) (J2000)\n(R.A., Dec) = (240.259, -45.968) deg = (16 01 02, -45 58 04) (J2000)\nThere was no significant excess flux in the previous transit at 06:25 UT, \nand in the next transit at 09:30 UT with an upper limit of 20 mCrab for each.",
  "circularId": 25262,
  "createdOn": 1564920058000,
  "email": "negoro.hitoshi@nihon-u.ac.jp",
  "subject": "GRB 190804B: MAXI/GSC detection",
  "submitter": "Hitoshi Negoro at Nihon U  <negoro.hitoshi@nihon-u.ac.jp>",
  "eventId": "GRB 190804B"
}