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 -8.672 sec. to 6.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.42622 ( -0.201096 0.187765 )
Norm@50keV : 5.00489E-03 ( -0.000690974 0.000679807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.96 using 59 PHA bins.
# Reduced chi-squared = 0.7186 for 57 degrees of freedom
# Null hypothesis probability = 9.460893e-01
Photon flux (15-150 keV) in 15.49 sec: 0.940561 ( -0.087041 0.087109 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61047e-07 ( -8.07141e-08 8.23877e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.672 sec. to 6.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.52043 ( -0.661644 1.10123 )
Epeak [keV] : 20.1229 ( )
Norm@50keV : 1.77485E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.36 using 59 PHA bins.
# Reduced chi-squared = 0.6672 for 56 degrees of freedom
# Null hypothesis probability = 9.738823e-01
Photon flux (15-150 keV) in 15.49 sec: 0.940592 ( -0.087046 0.086478 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.652 sec. to 1.652 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.20364 ( -0.265146 0.241434 )
Norm@50keV : 1.73202E-02 ( -0.00293752 0.00281943 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.67 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.786188e-01
Photon flux (15-150 keV) in 1 sec: 2.87320 ( -0.36033 0.36087 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62963e-07 ( -2.33487e-08 2.37179e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.652 sec. to 1.652 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.98867 ( )
Epeak [keV] : 2.46665 ( )
Norm@50keV : 2.25585E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.87 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 56 degrees of freedom
# Null hypothesis probability = 1.515639e-01
Photon flux (15-150 keV) in 1 sec: 2.87746 ( -0.3632 0.36341 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
