{
  "bibcode": "2011GCN.11692....1S",
  "body": "T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nA. P. Beardmore (U Leicester), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC),\nH. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), \nM. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU)\n(i.e. the Swift-BAT team):\n\nS. Sugita (Nagoya U.), K. Yamaoka (Aoyama Gakuin U.), N. Vasquez (Tokyo Tech.),\nT. Uehara, Y. Hanabata, T. Takahashi, Y. Fukazawa (Hiroshima U.),\nY. Terada, M. Tashiro, W. Iwakiri, K. Takahara, T. Yasuda (Saitama U.),\nM. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA),\nY. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji, Y. Nishioka,\nM. Yamauchi (Univ. of Miyazaki), Y. Urata, P. Tsai (NCU),\nK. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong (Nihon U.)\n(i.e. the Suzaku WAM team):\n\nWe performed the Swift/BAT and the Suzaku/WAM joint spectral analysis\nof GRB 110205A (Swift/BAT trigger #444643: Beardmore et al., GCN Circ. \n11629, Markwardt et al. GCN Circ. 11646).  The joint spectral analysis \nof the Swift/BAT and the Suzaku/WAM data allows us to derive the broad-band \nspectral parameters of this burst.\n\nThe time interval of the spectral data for each instrument is chosen\nfrom T0(BAT)+20.2 to T0(BAT)+318.2 sec where T0(BAT) is the trigger time\nof BAT at 02:02:41.3 UTC.  The energy ranges which we used in the joint\nspectral analysis are 15-150 keV and 100-3000 keV for the Swift/BAT and \nthe Suzaku/WAM respectively. The spectral data of two instruments are \nfitted with the spectral model multiplied by the constant factor to take\ninto account the systematic effective area uncertainties in the response\nmatrices of each instrument.\n\nThe spectrum is well fitted with a power-law with exponential cutoff \nmodel: dN/dE ~ E^{alpha}*exp(-(2+alpha)*E/Epeak). The constant factors \nof each instrument agree within 10%.  No systematic residual from the \nbest fit model is seen in the spectral data of each instrument.  The \nbest fit spectral parameters are: alpha = -1.59 (-0.06/+0.07) and Epeak \n= 230 (-65/+135) keV (chi2/dof = 96.6/85).  A simple power-law fit \nshows a poor fit to the data (chi2/dof=126.4/86).  The best fit spectral \nparameters for the Band function fixing beta = -2.5 are: \nalpha = -1.57 (-0.08/+0.10), and Epeak = 200 (-60/+130) keV (chi2/dof = 96.9/85).\nOur best fit spectral parameters are consistent with the Konus-Wind \nresult based on the 3 channel data (Golenetskii et al. GCN Circ. 11659).  \nThe energy fluence in the 15-3000 keV band calculated by a power-law with \nexponential cutoff model for this 298 sec interval is 2.7 (-0.4/+0.7)x10^-5 erg/cm2.\n\nAssuming z = 2.22 (Cenko et al. GCN Circ. 11638; Vreeswijk et al. GCN Circ. 11640) \nand a standard cosmology model with H_0 = 71 km/s/Mpc, Omega_M = 0.27, \nOmega_Lambda = 0.73, the isotropic energy release is \nE_iso = 4.6 (-0.7/+0.4) x10^53 erg in 1 keV to 10 MeV at the GRB rest frame.  \n\nAll the quoted errors are at the 90% confidence level.",
  "circularId": 11692,
  "createdOn": 1297364144000,
  "email": "Taka.Sakamoto@nasa.gov",
  "subject": "GRB 110205A: Swift/BAT and Suzaku/WAM joint spectral analysis",
  "submitter": "Takanori Sakamoto at NASA/GSFC  <Taka.Sakamoto@nasa.gov>",
  "eventId": "GRB 110205A"
}