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 13.656 sec. to 40.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.53709 ( -0.135966 0.13488 )
Norm@50keV : 6.95965E-03 ( -0.000579898 0.00057673 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.01 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.936363e-01
Photon flux (15-150 keV) in 27.23 sec: 0.877821 ( -0.070774 0.070834 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78767e-06 ( -1.61532e-07 1.63286e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.656 sec. to 40.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.775572 ( -0.570903 0.66936 )
Epeak [keV] : 74.7516 ( -17.0334 81.6657 )
Norm@50keV : 1.77853E-02 ( -0.0088415 0.0224981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.58 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 56 degrees of freedom
# Null hypothesis probability = 3.141741e-01
Photon flux (15-150 keV) in 27.23 sec: 0.850973 ( -0.073707 0.073638 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66279e-06 ( -1.85495e-07 1.87745e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 19.004 sec. to 20.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.1958 ( -0.296178 0.307796 )
Norm@50keV : 1.75705E-02 ( -0.00312695 0.00312367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.46 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.831840e-01
Photon flux (15-150 keV) in 1 sec: 2.06121 ( -0.37896 0.38014 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78493e-07 ( -3.43877e-08 3.46642e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 19.004 sec. to 20.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.754016 ( -0.684619 1.40043 )
Epeak [keV] : 154.778 ( -154.784 -154.784 )
Norm@50keV : 2.83406E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.00 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 56 degrees of freedom
# Null hypothesis probability = 1.694589e-01
Photon flux (15-150 keV) in 1 sec: 2.03049 ( -0.39054 0.38846 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74816e-07 ( -3.59295e-08 3.59255e-08 ) ergs/cm2
Time-resolved spectra
