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 -0.040 sec. to 8.792 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.38757 ( -0.0638111 0.0638512 )
Norm@50keV : 3.94060E-02 ( -0.00146619 0.00146617 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 68.05 using 59 bins.
Reduced chi-squared = 1.19386
# Null hypothesis probability of 1.50e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 8.832 sec: 4.78563 ( -0.19138 0.19178 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37201e-06 ( -1.32431e-07 1.32591e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.040 sec. to 8.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.844099 ( -0.268852 0.28573 )
Epeak [keV] : 119.833 ( -23.0674 60.4021 )
Norm@50keV : 6.95510E-02 ( -0.016626 0.0233043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.46 using 59 bins.
Reduced chi-squared = 0.990357
# Null hypothesis probability of 4.95e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 8.832 sec: 4.65535 ( -0.20046 0.20116 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29874e-06 ( -1.39165e-07 1.38886e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.124 sec. to 3.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.19472 ( -0.0836211 0.0836204 )
Norm@50keV : 0.115541 ( -0.005965 0.00596428 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 68.55 using 59 bins.
Reduced chi-squared = 1.20263
# Null hypothesis probability of 1.40e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 13.5522 ( -0.7235 0.7242 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17409e-06 ( -6.54514e-08 6.55912e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.124 sec. to 3.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.523147 ( -0.358351 0.388506 )
Epeak [keV] : 128.535 ( -27.0608 77.4114 )
Norm@50keV : 0.229619 ( -0.0688193 0.106577 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.68 using 59 bins.
Reduced chi-squared = 1.03
# Null hypothesis probability of 4.13e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 13.2877 ( -0.7359 0.7371 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16003e-06 ( -6.74833e-08 6.7381e-08 ) ergs/cm2
Time-resolved spectra
