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 -1.040 sec. to 132.848 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.89181 ( -0.280793 0.264442 )
Norm@50keV : 9.64012E-04 ( -0.000173639 0.000168312 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.89 using 59 PHA bins.
# Reduced chi-squared = 0.9103 for 57 degrees of freedom
# Null hypothesis probability = 6.667102e-01
Photon flux (15-150 keV) in 133.9 sec: 0.137876 ( -0.020123 0.020129 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18686e-06 ( -2.06198e-07 2.11664e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.040 sec. to 132.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.65504 ( -0.763499 1.64142 )
Epeak [keV] : 60.1939 ( )
Norm@50keV : 1.32720E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.78 using 59 PHA bins.
# Reduced chi-squared = 0.9247 for 56 degrees of freedom
# Null hypothesis probability = 6.352207e-01
Photon flux (15-150 keV) in 133.9 sec: 0.136672 ( -0.021239 0.020733 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15266e-06 ( -2.67235e-07 2.28618e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 10.372 sec. to 11.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.39905 ( -0.535599 0.555454 )
Norm@50keV : 5.79697E-03 ( -0.00180806 0.00180682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.63 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.834475e-01
Photon flux (15-150 keV) in 1 sec: 0.705823 ( -0.22869 0.230484 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60325e-08 ( -1.86516e-08 1.89483e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.372 sec. to 11.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.74583 ( -1.59801 4.00089 )
Epeak [keV] : 98.2053 ( -98.1843 -98.1843 )
Norm@50keV : 1.22710E-02 ( -0.012275 1.18585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.39 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 56 degrees of freedom
# Null hypothesis probability = 2.594450e-01
Photon flux (15-150 keV) in 1 sec: 0.689573 ( -0.238752 0.237424 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.37997e-08 ( -2.03008e-08 2.02597e-08 ) ergs/cm2
Time-resolved spectra
