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 2.360 sec. to 120.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.36536 ( -0.158217 0.159468 )
Norm@50keV : 2.14590E-03 ( -0.000192854 0.000192726 )
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#Fit statistic : Chi-Squared = 52.78 using 59 PHA bins.
# Reduced chi-squared = 0.9260 for 57 degrees of freedom
# Null hypothesis probability = 6.338731e-01
Photon flux (15-150 keV) in 118.5 sec: 0.259354 ( -0.024361 0.024446 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47548e-06 ( -2.41707e-07 2.4333e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.360 sec. to 120.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.29704 ( -0.214589 0.617798 )
Epeak [keV] : 505.014 ( -557.357 -557.357 )
Norm@50keV : 2.31569E-03 ( -0.000756563 0.00218297 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.76 using 59 PHA bins.
# Reduced chi-squared = 0.9421 for 56 degrees of freedom
# Null hypothesis probability = 5.982883e-01
Photon flux (15-150 keV) in 118.5 sec: 0.258605 ( -0.025162 0.02449 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4654e-06 ( -2.58374e-07 2.50962e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.364 sec. to 3.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.4869 ( -0.406351 0.388513 )
Norm@50keV : 1.17199E-02 ( -0.00293985 0.00290331 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.94 using 59 PHA bins.
# Reduced chi-squared = 0.7358 for 57 degrees of freedom
# Null hypothesis probability = 9.323989e-01
Photon flux (15-150 keV) in 1 sec: 1.45806 ( -0.35476 0.35552 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11435e-07 ( -3.0004e-08 3.06833e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.364 sec. to 3.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.236899 ( -0.984133 2.24596 )
Epeak [keV] : 73.6675 ( -24.3408 -73.6974 )
Norm@50keV : 4.76288E-02 ( -0.0475609 0.448126 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7156 for 56 degrees of freedom
# Null hypothesis probability = 9.465650e-01
Photon flux (15-150 keV) in 1 sec: 1.39700 ( -0.3641 0.36453 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05628e-07 ( -2.97999e-08 3.14507e-08 ) ergs/cm2
Time-resolved spectra
