{
  "bibcode": "2019GCN.23933....1N",
  "body": "S. Nakahira (RIKEN), S. Sugita (AGU), W. Iwakiri(Chuo U.), \nT. Mihara, F. Yatabe, Y. Takao, M. Matsuoka (RIKEN),\nH. Negoro, M. Nakajima, A. Sakamaki, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.), \nT. Sakamoto, M. Serino, T. Hashimoto, A. Yoshida (AGU), \nN. Kawai, M. Sugizaki, Y. Tachibana, K. Morita (Tokyo Tech), \nS. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai, T. Midooka (JAXA), \nY. Ueda, A. Tanimoto, T. Morita, S. Yamada, S. Ogawa (Kyoto U.), \nY. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.), \nH. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.), \nM. Yamauchi, K. Hidaka, S. Iwahori (Miyazaki U.), \nT. Kawamuro (NAOJ), \nK. Yamaoka (Nagoya U.),\nM. Shidatsu (Ehime U.),\nY. Kawakubo (LSU) \nreport on behalf of the MAXI team:\nUsing the MAXI/GSC count rate monitor data collected at one second intervals,\nwe have detected GRB 190305A reported by AGILE (Ursi et al., GCN23930) and CALET \nCGBM (Trigger ID 1235826131) with a duration of 1-2 sec.\nBecause this event is considered to be coming from outside of field of view, \nno localization was given.\n\nThen, about two minutes after the first event, MAXI/GSC nova alert system triggered \nan uncatalogued X-ray transient source at 2019/03/05 13:07:43 UT.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (11.326 deg, -50.122 deg) = (00 45 18, -50 07 19) (J2000) \nwith a statistical 90% C.L. elliptical error region \nwith long and short radii of 0.39 deg and 0.34 deg, respectively. \nThe roll angle of long axis from the north direction is 68.0 deg counterclockwise. \nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 101 +- 22 mCrab\n(4.0-10.0keV, 1 sigma error).\nThere was no significant excess flux in the previous transit at UT 11:35 \nand in the next transit at 14:40 UT with an upper limit of 20 mCrab for each.\n\nThe second event is possibly an extended mission of GRB 190305A.\nHowever, we cannot distinguish whether these two events are the same origin for now.\nFurther analysis is still in progress.",
  "circularId": 23933,
  "createdOn": 1551849026000,
  "email": "nakahira@crab.riken.jp",
  "subject": "GRB 190305A: MAXI/GSC detection",
  "submitter": "Satoshi Nakahira at RIKEN  <nakahira@crab.riken.jp>",
  "eventId": "GRB 190305A"
}