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 -1.224 sec. to 9.960 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.93245 ( -0.279787 0.260518 )
Norm@50keV : 2.77355E-03 ( -0.000507503 0.000489352 )
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#Fit statistic : Chi-Squared = 45.82 using 59 PHA bins.
# Reduced chi-squared = 0.8039 for 57 degrees of freedom
# Null hypothesis probability = 8.556099e-01
Photon flux (15-150 keV) in 11.18 sec: 0.403657 ( -0.05575 0.05575 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85273e-07 ( -4.92517e-08 5.07905e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.224 sec. to 9.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.94548 ( -0.677016 1.00326 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 2.75050E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.83 using 59 PHA bins.
# Reduced chi-squared = 0.8183 for 56 degrees of freedom
# Null hypothesis probability = 8.321073e-01
Photon flux (15-150 keV) in 11.18 sec: 0.404939 ( -0.084865 0.054859 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.87139e-07 ( -5.08784e-08 3.97208e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.74624 ( -0.385386 0.367754 )
Norm@50keV : 6.29604E-03 ( -0.00161951 0.00157062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.78 using 59 PHA bins.
# Reduced chi-squared = 1.329 for 57 degrees of freedom
# Null hypothesis probability = 4.879432e-02
Photon flux (15-150 keV) in 1 sec: 0.850192 ( -0.186793 0.186818 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.81179e-08 ( -1.50206e-08 1.55656e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 9.98933 ( -4.19105 -9.99613 )
Epeak [keV] : 28.9973 ( -2.43922 2.60064 )
Norm@50keV : 1.26454E+06 ( -1.28648e+06 2.96301e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.71 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 56 degrees of freedom
# Null hypothesis probability = 1.548034e-01
Photon flux (15-150 keV) in 1 sec: 0.841800 ( -0.248093 0.071762 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.46298e-08 ( -2.86438e-08 -1.45782e-08 ) ergs/cm2
Time-resolved spectra
