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 -0.720 sec. to 39.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.17649 ( -0.150629 0.144302 )
Norm@50keV : 2.31599E-03 ( -0.000227806 0.000224269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.46 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.215796e-01
Photon flux (15-150 keV) in 40.52 sec: 0.378780 ( -0.026878 0.026892 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.79689e-07 ( -7.43676e-08 7.58299e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.720 sec. to 39.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.16809 ( -0.209824 0.137026 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 2.33273E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.47 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 56 degrees of freedom
# Null hypothesis probability = 3.846534e-01
Photon flux (15-150 keV) in 40.52 sec: 0.370663 ( -0.028637 0.028667 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.3643e-07 ( -8.76411e-08 9.18082e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 22.456 sec. to 23.456 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.06327 ( -0.169664 0.162043 )
Norm@50keV : 1.46977E-02 ( -0.00165462 0.00162352 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.45 using 59 PHA bins.
# Reduced chi-squared = 0.8851 for 57 degrees of freedom
# Null hypothesis probability = 7.175318e-01
Photon flux (15-150 keV) in 1 sec: 2.27148 ( -0.19375 0.1938 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36138e-07 ( -1.3913e-08 1.41935e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 22.456 sec. to 23.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.63182 ( -0.484664 0.702156 )
Epeak [keV] : 34.9907 ( -27.5638 -34.9907 )
Norm@50keV : 2.62612E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.96 using 59 PHA bins.
# Reduced chi-squared = 0.8743 for 56 degrees of freedom
# Null hypothesis probability = 7.361955e-01
Photon flux (15-150 keV) in 1 sec: 2.23257 ( -0.20076 0.20084 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
