{
  "bibcode": "2010GCN.11151....1S",
  "body": "M. Serino, T. Mihara, Y.E. Nakagawa, M. Sugizaki, T. Yamamoto, \nT. Sootome, M. Matsuoka (RIKEN), \nN. Kawai, M. Morii, K. Sugimori, R. Usui (Tokyo Tech),\nK. Kawasaki, S. Ueno, H. Tomida, M. Kohama, M. Ishikawa (JAXA),\nA. Yoshida, K. Yamaoka,  S. Nakahira (AGU),\nH. Tsunemi, M. Kimura (Osaka U.), H. Negoro, M. Nakajima\nH. Ozawa, F. Suwa (Nihon U.), Y. Ueda, N. Isobe, \nS. Eguchi, K. Hiroi (Kyoto U.), A. Daikyuji (Miyazaki U.), A. Uzawa, \nT. Matsumura, K. Yamazaki (Chuo U.) report on behalf of the MAXI team:\n\nThe Gas Slit Camera (GSC) of MAXI detected a bright X-ray source at the\nposition consistent with GRB 100823A (Mangano et al, GCN 11135).\nAssuming the XRT position (Goad et al., GCN 11136), the transit\nof GSC over the source started at 17:25:25 UT on 23 August 2010,\n10 seconds before the Swift/BAT trigger time.\nA significant (8 sigma in 2-20 keV) rise of the count rate above the background\nwas observed at 17:25:33, and the burst was detected significantly for 25 seconds.\nThe peak X-ray flux (4-10 keV) was about 2.5 Crab, which was corrected for the collimator transmission efficiency assuming the source position by Swift XRT.\nThere are significant time structure within the transit light curve, \nwhich would be simply triangular for a steady source.\nFrom the preliminary spectral analysis, the time-averaged spectrum \nfrom T+0 to T+25 sec is best fit by a power-law model with a photon index \nof 2.0 +/- 0.2. The fluence in the 2-20 keV band is 5.1 +0.5 -0.9 x 10^-7 erg/cm2.\n\nThe sky image and the transit light curve is shown at the MAXI web site\nhttp://maxi.riken.jp/ in the \"News\" section.",
  "circularId": 11151,
  "createdOn": 1282925192000,
  "email": "motoko@crab.riken.jp",
  "subject": "GRB 100823A: MAXI/GSC detection",
  "submitter": "Motoko Suzuki at RIKEN  <motoko@crab.riken.jp>",
  "eventId": "GRB 100823A"
}