{
  "bibcode": "2015GCN.17825....1K",
  "body": "T. Kawamuro (Kyoto U.), S. Nakahira, S. Ueno, H. Tomida, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA), \nT. Mihara, M. Sugizaki, M. Serino, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), \nN. Kawai, T. Yoshii, Y. Tachibana (Tokyo Tech), \nA. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU), \nH. Tsunemi, R.Imatani (Osaka U.), \nH. Negoro, M. Nakajima, K. Tanaka, T. Masumitsu (Nihon U.), \nY. Ueda, T. Hori (Kyoto U.), \nY. Tsuboi, S. Kanetou (Chuo U.), \nM. Yamauchi, D. Itoh (Miyazaki U.), \nK. Yamaoka (Nagoya U.), M. Morii (ISM)\nreport on behalf of the MAXI team:\n\nThe MAXI/GSC nova alert system triggered a bright uncatalogued X-ray \ntransient source at 21:42:14 UT.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n\n(R.A., Dec) = (234.342 deg, 16.307 deg) = (15 37 22, +16 18 25) (J2000)\n\nwith a statistical 90% C.L. elliptical error region with long and short radii \nof 0.20 deg and 0.20 deg, respectively. The roll angle of long axis from \nthe north direction is 75.0 deg counterclockwise. There is an additional \nsystematic uncertainty of 0.1 deg (90% containment radius).\n\nThe X-ray flux averaged over the scan was 327 +- 49 mCrab\n(4-10keV, 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\n(R.A., Dec) = (233.970 deg, 15.521 deg) = (15 35 52, +15 31 15) (J2000)\n(R.A., Dec) = (233.627 deg, 15.744 deg) = (15 34 30, +15 44 38) (J2000)\n(R.A., Dec) = (234.594 deg, 16.941 deg) = (15 38 22, +16 56 26) (J2000)\n(R.A., Dec) = (234.939 deg, 16.717 deg) = (15 39 45, +16 43 01) (J2000)\n\nThere was no significant excess flux in the previous transit at 5/18 21:39 UT.",
  "circularId": 17825,
  "createdOn": 1431991654000,
  "email": "negoro@phys.cst.nihon-u.ac.jp",
  "subject": "GRB 150518A: MAXI/GSC detection",
  "submitter": "H. Negoro at Nihon U.  <negoro@phys.cst.nihon-u.ac.jp>",
  "eventId": "GRB 150518A"
}