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 0.084 sec. to 1.648 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.92336 ( -0.21394 0.201199 )
Norm@50keV : 1.12170E-02 ( -0.00163388 0.00159966 )
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#Fit statistic : Chi-Squared = 55.03 using 59 PHA bins.
# Reduced chi-squared = 0.9655 for 57 degrees of freedom
# Null hypothesis probability = 5.492685e-01
Photon flux (15-150 keV) in 1.564 sec: 1.62606 ( -0.1868 0.18681 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61367e-07 ( -2.25682e-08 2.31286e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.084 sec. to 1.648 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.505062 ( -1.04667 1.2754 )
Epeak [keV] : 42.4999 ( -8.19851 15.1766 )
Norm@50keV : 7.65264E-02 ( -0.0765289 0.359076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.42 using 59 PHA bins.
# Reduced chi-squared = 0.8825 for 56 degrees of freedom
# Null hypothesis probability = 7.204400e-01
Photon flux (15-150 keV) in 1.564 sec: 1.55381 ( -0.1908 0.19236 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41006e-07 ( -2.24379e-08 2.57331e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.088 sec. to 1.088 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.84621 ( -0.218292 0.205874 )
Norm@50keV : 1.34781E-02 ( -0.00203382 0.00199546 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.42 using 59 PHA bins.
# Reduced chi-squared = 0.9197 for 57 degrees of freedom
# Null hypothesis probability = 6.473129e-01
Photon flux (15-150 keV) in 1 sec: 1.89169 ( -0.23664 0.23665 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23954e-07 ( -1.85056e-08 1.89124e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.088 sec. to 1.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.037099 ( -1.12505 1.40878 )
Epeak [keV] : 45.1547 ( -7.09223 11.7971 )
Norm@50keV : 0.162792 ( -0.162794 0.898274 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.25 using 59 PHA bins.
# Reduced chi-squared = 0.7724 for 56 degrees of freedom
# Null hypothesis probability = 8.935842e-01
Photon flux (15-150 keV) in 1 sec: 1.80066 ( -0.23843 0.24006 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07436e-07 ( -1.74448e-08 1.95249e-08 ) ergs/cm2
Time-resolved spectra
