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 -6.576 sec. to 115.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.03226 ( -0.184774 0.175927 )
Norm@50keV : 1.21989E-03 ( -0.000139226 0.000135509 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.60 using 59 PHA bins.
# Reduced chi-squared = 0.9580 for 57 degrees of freedom
# Null hypothesis probability = 5.654623e-01
Photon flux (15-150 keV) in 121.7 sec: 0.185765 ( -0.016679 0.016707 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37196e-06 ( -1.43388e-07 1.45721e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.576 sec. to 115.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.12293 ( -0.109184 0.514566 )
Epeak [keV] : 63.8388 ( )
Norm@50keV : 1.08478E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.37 using 59 PHA bins.
# Reduced chi-squared = 0.9709 for 56 degrees of freedom
# Null hypothesis probability = 5.366711e-01
Photon flux (15-150 keV) in 121.7 sec: 0.184041 ( -0.027287 0.018896 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.36719e-06 ( -4.52907e-07 1.5301e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.356 sec. to 1.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.74394 ( -0.263818 0.252464 )
Norm@50keV : 1.25033E-02 ( -0.00213072 0.0020985 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.17 using 59 PHA bins.
# Reduced chi-squared = 1.213 for 57 degrees of freedom
# Null hypothesis probability = 1.294714e-01
Photon flux (15-150 keV) in 1 sec: 1.68697 ( -0.27166 0.27219 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15433e-07 ( -2.0059e-08 2.0267e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.356 sec. to 1.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.454917 ( -1.20662 1.68221 )
Epeak [keV] : 56.3644 ( -12.9611 108.495 )
Norm@50keV : 6.05903E-02 ( -0.0607933 0.427708 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.82 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 56 degrees of freedom
# Null hypothesis probability = 1.734325e-01
Photon flux (15-150 keV) in 1 sec: 1.62580 ( -0.27892 0.27914 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07394e-07 ( -2.10465e-08 2.17071e-08 ) ergs/cm2
Time-resolved spectra
