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 -51.120 sec. to 11.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.34627 ( -0.265386 0.242233 )
Norm@50keV : 1.36974E-03 ( -0.000256972 0.000251898 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.12 using 59 PHA bins.
# Reduced chi-squared = 0.9320 for 57 degrees of freedom
# Null hypothesis probability = 6.213302e-01
Photon flux (15-150 keV) in 63.06 sec: 0.245721 ( -0.030457 0.030459 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33054e-07 ( -1.24286e-07 1.27947e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -51.120 sec. to 11.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.57291 ( -0.427269 1.3126 )
Epeak [keV] : 20.7242 ( )
Norm@50keV : 4.11126E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.25 using 59 PHA bins.
# Reduced chi-squared = 0.9152 for 56 degrees of freedom
# Null hypothesis probability = 6.549154e-01
Photon flux (15-150 keV) in 63.06 sec: 0.240354 ( -0.030982 0.031074 ) 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 -0.348 sec. to 0.652 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.21027 ( -0.421672 0.364219 )
Norm@50keV : 7.80730E-03 ( -0.00214982 0.00203505 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.09 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 57 degrees of freedom
# Null hypothesis probability = 4.348104e-01
Photon flux (15-150 keV) in 1 sec: 1.29967 ( -0.25068 0.25081 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.35275e-08 ( -1.676e-08 1.72838e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.348 sec. to 0.652 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.9179 ( )
Epeak [keV] : 12.4742 ( )
Norm@50keV : 1.13781E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.97 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 56 degrees of freedom
# Null hypothesis probability = 4.026600e-01
Photon flux (15-150 keV) in 1 sec: 1.28900 ( -0.25357 0.24837 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
