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 -48.864 sec. to 17.376 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.86893 ( -0.287469 0.268998 )
Norm@50keV : 7.96516E-04 ( -0.00014629 0.000140808 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.71 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 57 degrees of freedom
# Null hypothesis probability = 3.435935e-01
Photon flux (15-150 keV) in 66.24 sec: 0.112837 ( -0.0156726 0.015672 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.85121e-07 ( -8.59948e-08 8.91941e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -48.864 sec. to 17.376 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.25716 ( )
Epeak [keV] : 98.5114 ( )
Norm@50keV : 5.02775E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.58 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 56 degrees of freedom
# Null hypothesis probability = 3.142092e-01
Photon flux (15-150 keV) in 66.24 sec: 0.105476 ( -0.0252752 0.021322 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.13561e-07 ( -9.99509e-08 1.00352e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.028 sec. to 2.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.25195 ( -0.574446 0.584744 )
Norm@50keV : 3.65199E-03 ( -0.00105236 0.00104891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.35 using 59 PHA bins.
# Reduced chi-squared = 0.8832 for 57 degrees of freedom
# Null hypothesis probability = 7.211345e-01
Photon flux (15-150 keV) in 1 sec: 0.432069 ( -0.127057 0.12757 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65351e-08 ( -1.19258e-08 1.22323e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.028 sec. to 2.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.24704 ( -0.578667 0.588774 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.66811E-03 ( -0.001059 0.0148689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.35 using 59 PHA bins.
# Reduced chi-squared = 0.8991 for 56 degrees of freedom
# Null hypothesis probability = 6.877700e-01
Photon flux (15-150 keV) in 1 sec: 0.432008 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.67046e-08 ( -1.35664e-08 1.38732e-08 ) ergs/cm2
Time-resolved spectra
