{
  "bibcode": "2018GCN.22347....1K",
  "body": "H. Kawai (Chuo U.), H. Negoro (Nihon U.), M. Serino (AGU), S. Nakahira (RIKEN),\nS. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai (JAXA),\nT. Mihara, M. Sugizaki, W. Iwakiri, M. Shidatsu, F. Yatabe, Y. Takao, M. Matsuoka (RIKEN),\nN. Kawai, S. Sugita, T. Yoshii, Y. Tachibana, S. Harita, Y. Muraki, K. Morita (Tokyo Tech),\nA. Yoshida, T. Sakamoto, Y. Kawakubo, Y. Kitaoka, T. Hashimoto (AGU),\nH. Tsunemi, T. Yoneyama (Osaka U.),\nM. Nakajima, T. Kawase, A. Sakamaki (Nihon U.),\nY. Ueda, T. Hori, A. Tanimoto, S. Oda, T. Morita, S. Yamada (Kyoto U.),\nY. Tsuboi, Y. Nakamura, R. Sasaki, T. Sato (Chuo U.),\nM. Yamauchi, C. Hanyu, K, Hidaka (Miyazaki U.),\nT. Kawamuro (NAOJ),\nK. Yamaoka (Nagoya U.)\n\nreport on behalf of the MAXI team:\nThe MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient \nsource at 00:37:30 UT on 16 January 2018.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (215.655 deg, 18.959 deg) = (14 22 37, +18 57 32) (J2000)\nwith a statistical 90% C.L. elliptical error region\nwith long and short radii of 0.13 deg and 0.11 deg, respectively.\nThe roll angle of long axis from the north direction is 158.0 deg counterclockwise.\nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 609 +- 65 mCrab\n(4.0-10.0keV, 1 sigma error).\nWithout assumptions on the source constancy,we obtain a rectangular error\nbox for the transient source with the following corners:\n(R.A., Dec) = (214.873, 19.864) deg = (14 19 29, +19 51 48) (J2000)\n(R.A., Dec) = (214.781, 19.788) deg = (14 19 07, +19 47 16) (J2000)\n(R.A., Dec) = (216.314, 18.226) deg = (14 25 15, +18 13 31) (J2000)\n(R.A., Dec) = (216.405, 18.300) deg = (14 25 37, +18 18 01) (J2000)\nThere was no significant excess flux in the previous transit at UT 23:04\nwith an upper limit of 20 mCrab.",
  "circularId": 22347,
  "createdOn": 1516066013000,
  "email": "motoko@crab.riken.jp",
  "subject": "GRB 180116A: MAXI/GSC detection",
  "submitter": "Motoko Suzuki at RIKEN  <motoko@crab.riken.jp>",
  "eventId": "GRB 180116A"
}