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 -8.796 sec. to 44.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.64326 ( -0.118208 0.116363 )
Norm@50keV : 2.25567E-03 ( -0.000148295 0.000146779 )
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#Fit statistic : Chi-Squared = 59.03 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 4.012400e-01
Photon flux (15-150 keV) in 53.68 sec: 0.293896 ( -0.017531 0.017551 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12708e-06 ( -7.99413e-08 8.10509e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.796 sec. to 44.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.55621 ( -0.195893 0.448175 )
Epeak [keV] : 240.328 ( -240.328 -240.328 )
Norm@50keV : 2.50570E-03 ( -0.000645409 0.00173959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.90 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 56 degrees of freedom
# Null hypothesis probability = 3.697646e-01
Photon flux (15-150 keV) in 53.68 sec: 0.292250 ( -0.019149 0.018676 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11587e-06 ( -9.55096e-08 8.96472e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.116 sec. to 3.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.03985 ( -0.59858 0.516577 )
Norm@50keV : 3.08211E-03 ( -0.00121727 0.00117054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.97 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.686809e-01
Photon flux (15-150 keV) in 1 sec: 0.471028 ( -0.117809 0.118061 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.84971e-08 ( -9.65323e-09 1.08706e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.116 sec. to 3.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.10143 ( -0.48699 2.43125 )
Epeak [keV] : 44.4961 ( )
Norm@50keV : 2.64856E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.77 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.405615e-01
Photon flux (15-150 keV) in 1 sec: 0.439900 ( -0.235787 0.147199 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81916e-08 ( -2.44174e-08 4.82482e-09 ) ergs/cm2
Time-resolved spectra
