Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -20.328 sec. to 298.576 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.46886 ( -0.0779128 0.077997 )
Norm@50keV : 1.47809E-03 ( -6.10598e-05 6.0989e-05 )
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#Fit statistic : Chi-Squared = 52.79 using 59 PHA bins.
# Reduced chi-squared = 0.9261 for 57 degrees of freedom
# Null hypothesis probability = 6.337330e-01
Photon flux (15-150 keV) in 318.9 sec: 0.183026 ( -0.007964 0.007991 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.49588e-06 ( -2.02255e-07 2.02998e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.328 sec. to 298.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.46607 ( -0.0878969 0.248061 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.48276E-03 ( -6.13134e-05 6.07311e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.80 using 59 PHA bins.
# Reduced chi-squared = 0.9428 for 56 degrees of freedom
# Null hypothesis probability = 5.969336e-01
Photon flux (15-150 keV) in 318.9 sec: 0.183443 ( -0.009345 0.008465 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.508e-06 ( -2.4766e-07 1.63048e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.644 sec. to 3.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.04806 ( -0.062098 0.0624252 )
Norm@50keV : 6.02843E-02 ( -0.00223215 0.00223086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.62 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.157897e-01
Photon flux (15-150 keV) in 1 sec: 0.379390 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.41195e-07 ( -2.57064e-08 2.57653e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.644 sec. to 3.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.422173 ( -0.265599 0.282665 )
Epeak [keV] : 146.259 ( -28.221 63.2639 )
Norm@50keV : 0.113998 ( -0.0263052 0.0364502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.12 using 59 PHA bins.
# Reduced chi-squared = 0.7343 for 56 degrees of freedom
# Null hypothesis probability = 9.318322e-01
Photon flux (15-150 keV) in 1 sec: 6.80537 ( -0.27094 0.27111 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2647e-07 ( -2.70931e-08 2.70216e-08 ) ergs/cm2
Time-resolved spectra
