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 -0.936 sec. to 12.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.58938 ( -0.195119 0.192205 )
Norm@50keV : 6.55026E-03 ( -0.000748981 0.000742182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.76 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.242971e-01
Photon flux (15-150 keV) in 13 sec: 0.839019 ( -0.093405 0.093569 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.97523e-07 ( -9.7627e-08 9.86947e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.936 sec. to 12.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.30141 ( -0.376134 0.761347 )
Epeak [keV] : 120.284 ( -120.288 -120.288 )
Norm@50keV : 9.18918E-03 ( -0.00329784 0.0126015 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.22 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.106426e-01
Photon flux (15-150 keV) in 13 sec: 0.828125 ( -0.096898 0.096809 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.80608e-07 ( -1.05267e-07 1.0584e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.064 sec. to 7.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.70375 ( -0.48233 0.442972 )
Norm@50keV : 9.37719E-03 ( -0.00277693 0.00267588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.56 using 59 PHA bins.
# Reduced chi-squared = 0.9923 for 57 degrees of freedom
# Null hypothesis probability = 4.915585e-01
Photon flux (15-150 keV) in 1 sec: 1.24709 ( -0.329594 0.33003 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.6808e-08 ( -2.60085e-08 2.68212e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.064 sec. to 7.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.04045 ( -1.54228 2.17055 )
Epeak [keV] : 69.4822 ( )
Norm@50keV : 2.09565E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.08 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.718627e-01
Photon flux (15-150 keV) in 1 sec: 1.22126 ( -0.335799 0.33593 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.3372e-08 ( -2.64238e-08 2.80164e-08 ) ergs/cm2
Time-resolved spectra
