{
  "bibcode": "2009GCN..9852....1M",
  "body": "M. Matsuoka (JAXA), S. Miyoshi, M. Nakajima, H. Negoro, R. Ishiwata (Nihon\nUniv.), K. Kawasaki, S. Ueno, H. Tomida, M. Suzuki, M. Ishikawa (JAXA),\nT. Mihara, M. Kohama, Y.E. Nakagawa, M. Sugizaki, T. Yamamoto (RIKEN), \nN. Kawai, M. Morii, K. Sugimori (Tokyo Tech), A. Yoshida, K. Yamaoka, \nS. Nakahira (Aoyama G. Univ.), H. Tsunemi, M. Kimura (Osaka Univ.), \nY. Ueda, N. Isobe, S. Eguchi and K. Hiroi (Kyoto Univ.) report on behalf of\nthe MAXI team:\n\nThe Gas Slit Camera (GSC) of MAXI, the all-sky X-ray monitor on the ISS,\ndetected a bright X-ray source at the position consistent with GRB 090831\n(Rau et al, GCN 9850) in the energy range of 2-30 keV.  \nThe nominal location of the source as measured by GSC is \n\n(R.A., Dec.) = (145.4 deg, +51.4 deg) = (09:41:36, +51:24:00) (J2000)\n\nwith an estimated systematic uncertainty of about 1 degree.\n\nThe source was detected for 60 seconds during the transit of GSC over \nthe source starting approximately at 07:36:35 UT on 31 August 2009, \nvery close to the Fermi GBM trigger time.\nThe X-ray flux at the peak of the transit was about 3 Crab.\nThere are significant time structure within the transit light curve, \nwhich would be simply triangular for a steady source.\n\nThe all-sky image and the transit light curve is shown at the MAXI web site\nhttp://maxi.riken.jp/ in the \"News\" section.\n\nMAXI is currently in the commissioning phase that runs for three months.\nThe systematic uncertainty in localization will be significantly improved\nwith the progress of the alignment calibration.",
  "circularId": 9852,
  "createdOn": 1251746572000,
  "email": "nkawai@hp.phys.titech.ac.jp",
  "subject": "GRB 090831: MAXI GSC detection",
  "submitter": "Nobuyuki Kawai at Tokyo Tech  <nkawai@hp.phys.titech.ac.jp>",
  "eventId": "GRB 090831"
}