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 2.244 sec. to 11.676 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.34592 ( -0.275889 0.279583 )
Norm@50keV : 3.09471E-03 ( -0.00048326 0.000482605 )
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#Fit statistic : Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9642 for 57 degrees of freedom
# Null hypothesis probability = 5.519712e-01
Photon flux (15-150 keV) in 9.432 sec: 0.372517 ( -0.059844 0.060072 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.8538e-07 ( -4.89877e-08 4.96267e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.244 sec. to 11.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.08585 ( -1.57593 1.23954 )
Epeak [keV] : 180.845 ( -180.868 -180.868 )
Norm@50keV : 4.16062E-03 ( -0.00151764 0.0122224 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.78 using 59 PHA bins.
# Reduced chi-squared = 0.9782 for 56 degrees of freedom
# Null hypothesis probability = 5.211698e-01
Photon flux (15-150 keV) in 9.432 sec: 0.368027 ( -0.062609 0.062476 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79668e-07 ( -5.49472e-08 5.36153e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.480 sec. to 6.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.00886 ( -0.514144 0.604807 )
Norm@50keV : 4.65914E-03 ( -0.0015134 0.00146615 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.56 using 59 PHA bins.
# Reduced chi-squared = 1.536 for 57 degrees of freedom
# Null hypothesis probability = 5.733856e-03
Photon flux (15-150 keV) in 1 sec: 0.536666 ( -0.173582 0.176983 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02296e-08 ( -1.58073e-08 1.59936e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.480 sec. to 6.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.560037 ( 0.608762 2.66428 )
Epeak [keV] : 159.367 ( -187.223 -187.223 )
Norm@50keV : 7.79070E-03 ( -0.00386919 0.161256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.47 using 59 PHA bins.
# Reduced chi-squared = 1.562 for 56 degrees of freedom
# Null hypothesis probability = 4.534824e-03
Photon flux (15-150 keV) in 1 sec: 0.530573 ( -0.173509 0.179068 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.89497e-08 ( -1.82708e-08 1.69009e-08 ) ergs/cm2
Time-resolved spectra
