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 -0.472 sec. to 14.572 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.10499 ( -0.17978 0.170695 )
Norm@50keV : 3.34061E-03 ( -0.000397766 0.000390573 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.51 using 59 PHA bins.
# Reduced chi-squared = 0.6581 for 57 degrees of freedom
# Null hypothesis probability = 9.784932e-01
Photon flux (15-150 keV) in 15.04 sec: 0.526909 ( -0.044795 0.0448 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.6713e-07 ( -4.91289e-08 5.04381e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.472 sec. to 14.572 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.48981 ( -0.623981 0.959629 )
Epeak [keV] : 32.3344 ( -28.1276 17.5372 )
Norm@50keV : 7.80513E-03 ( -0.004868 0.0221186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.63 using 59 PHA bins.
# Reduced chi-squared = 0.6363 for 56 degrees of freedom
# Null hypothesis probability = 9.845923e-01
Photon flux (15-150 keV) in 15.04 sec: 0.512171 ( -0.048139 0.048232 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.32541e-07 ( -5.95164e-08 6.49641e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.396 sec. to 1.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.89884 ( -0.241389 0.227452 )
Norm@50keV : 9.99795E-03 ( -0.00159957 0.00155718 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.72 using 59 PHA bins.
# Reduced chi-squared = 0.8548 for 57 degrees of freedom
# Null hypothesis probability = 7.742589e-01
Photon flux (15-150 keV) in 1 sec: 1.43420 ( -0.17831 0.1783 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.19327e-08 ( -1.41684e-08 1.4587e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.396 sec. to 1.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.37834 ( -0.800107 1.15884 )
Epeak [keV] : 48.7573 ( )
Norm@50keV : 2.02420E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.81 using 59 PHA bins.
# Reduced chi-squared = 0.8538 for 56 degrees of freedom
# Null hypothesis probability = 7.736899e-01
Photon flux (15-150 keV) in 1 sec: 1.40688 ( -0.18414 0.18444 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
