{
  "bibcode": "2006GCN..4822....1S",
  "body": "T. Sakamoto (GSFC/ORAU), L. Barbier (GSFC), S. Barthelmy (GSFC), \nJ. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), \nD. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),\nD. Palmer (LANL), A. Parsons (GSFC), G. Sato (ISAS), J. Tueller (GSFC), \non behalf of the Swift-BAT team:\n\nWe report further analysis of BAT GRB 060218/SN 2006aj (trigger #191157)  \n(Cusumano, et al., GCN 4775, Barbier, et al., GCN 4780, \nNousek, et al., GCN 4805).  \n\nThe time-averaged spectrum from T-8 to T+2732 is best fit by \na simple power-law model.  The power law index of the time-averaged \nspectrum is 2.5 +- 0.1.  The fluence in the 15-150 keV band is \n6.8 +- 0.4 x 10^-6 erg/cm2.  The peak energy flux in 1.6 sec time \ninterval starting from T+455.2 sec in the 15-150 keV band is \n2.0 +- 1.1 x 10^-8 erg/cm2/sec.  \n\nUsing the redshift of z=0.033 (Soderberg, et al., GCN 4804), the \nisotropic equivalent energy, Eiso, is 1.9 +- 0.1 x 10^49 erg, \nand the peak luminosity, Liso, is 6 +- 3 x 10^46 erg/s in \n15.5 keV -  154.8 keV at the GRB rest frame.  This Eiso is \ncomparable to that of the one of the softest X-ray flash XRF 020903 \nobserved by HETE-2 (Sakamoto et al., ApJ, 602, 875, Soderberg et al., \nApJ, 606, 994).  The Liso is comparable to that of GRB 980425/SN 1998bw \n(Galama et al., Nature, 395, 670).  Note that the BAT Eiso and Liso \nof GRB 060218 are not bolometric values due to its narrow energy band.  \n \nAll the quoted errors are at the 90% confidence level.  We use \nOmega_M = 0.3, Omega_lamda = 0.7, and H0 = 65 in the calculation \nof the luminosity distance.",
  "circularId": 4822,
  "createdOn": 1140729562000,
  "email": "takanori@milkyway.gsfc.nasa.gov",
  "subject": "GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux",
  "submitter": "Takanori Sakamoto at NASA/GSFC  <takanori@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 060218"
}