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 0.000 sec. to 8.448 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.13507 ( -0.258214 0.268767 )
Norm@50keV : 1.30680E-02 ( -0.00208904 0.00208555 )
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#Fit statistic : Chi-Squared = 49.65 using 59 PHA bins.
# Reduced chi-squared = 0.8710 for 57 degrees of freedom
# Null hypothesis probability = 7.446270e-01
Photon flux (15-150 keV) in 8.448 sec: 1.52140 ( -0.25098 0.25228 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14173e-06 ( -1.93762e-07 1.95462e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.22931 ( -1.25062 1.76431 )
Epeak [keV] : 85.5440 ( -23.9997 293.748 )
Norm@50keV : 5.92742E-02 ( -0.0592742 0.347382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.13 using 59 PHA bins.
# Reduced chi-squared = 0.8238 for 56 degrees of freedom
# Null hypothesis probability = 8.237384e-01
Photon flux (15-150 keV) in 8.448 sec: 1.44315 ( -0.26079 0.2627 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03924e-06 ( -2.20522e-07 2.21612e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.900 sec. to 2.900 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.373942 ( -1.00871 0.373858 )
Norm@50keV : 7.50778E-03 ( -0.00750715 0.00582873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.07 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.921641e-01
Photon flux (15-150 keV) in 1 sec: 0.910578 ( -0.910578 0.623732 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07758e-07 ( -1.02328e-07 4.86756e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.900 sec. to 2.900 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.361199 ( -3.86792 5.1115 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 7.57073E-03 ( -0.00757176 -0.00757176 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.07 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 56 degrees of freedom
# Null hypothesis probability = 1.679451e-01
Photon flux (15-150 keV) in 1 sec: 0.933137 ( -0.933137 0.637533 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08208e-07 ( -5.29812e-08 5.2087e-08 ) ergs/cm2
Time-resolved spectra
