{
  "bibcode": "2015GCN.18705....1K",
  "body": "T. Kawamuro (Kyoto U.), H. Negoro (Nihon U.), S. Nakahira (JAXA), T. Sakamoto (AGU), \nH. Tomida, M. Ishikawa, Y. E. Nakagawa (JAXA), \nT. Mihara, M. Sugizaki, M. Serino, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), \nN. Kawai, M. Arimoto, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara (Tokyo Tech), \nA. Yoshida, Y. Kawakubo, H. Ohtsuki (AGU), \nH. Tsunemi, R.Imatani (Osaka U.), \nM. Nakajima, K. Tanaka, T. Masumitsu (Nihon U.), \nY. Ueda, T. Hori, A. Tanimoto (Kyoto U.), \nY. Tsuboi, S. Kanetou, Y. Nakamura, R. Sasaki (Chuo U.), \nM. Yamauchi, D. Itoh, K. Furuya (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 transient \nsource at UT 2015-12-16T19:03:15.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (323.762 deg, 24.765 deg) = (21 35 02, +24 45 54) (J2000)\nwith a statistical 90% C.L. elliptical error region\nwith long and short radii of 0.32 deg and 0.25 deg, respectively.\nThe roll angle of long axis from the north direction is 162.0 deg counterclockwise.\nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 140 +- 25 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(322.253 deg, 24.688 deg) = (21 29 00, +24 41 17) (J2000)\n(322.468 deg, 24.080 deg) = (21 29 52, +24 04 46) (J2000)\n(324.455 deg, 24.613 deg) = (21 37 49, +24 36 46) (J2000)\n(324.259 deg, 25.227 deg) = (21 37 02, +25 13 37) (J2000)\n\nThere was no significant excess flux in the previous transit at UT 17:30\nand in the next transit at 20:35 UT with an upper limit of 20 mCrab for each.\n\nDetection Information:\nhttp://maxi.riken.jp/alert/novae/7372632950/7372632950.htm <http://maxi.riken.jp/alert/novae/7372632950/7372632950.htm>",
  "circularId": 18705,
  "createdOn": 1450319234000,
  "email": "nkawai@hp.phys.titech.ac.jp",
  "subject": "GRB 151216A: MAXI/GSC detection",
  "submitter": "Nobuyuki Kawai at Tokyo Tech  <nkawai@hp.phys.titech.ac.jp>",
  "eventId": "GRB 151216A"
}