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 -3.816 sec. to 527.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.34547 ( -0.0273285 0.0274723 )
Norm@50keV : 1.62355E-02 ( -0.00024236 0.00024175 )
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#Fit statistic : Chi-Squared = 34.85 using 59 PHA bins.
# Reduced chi-squared = 0.6114 for 57 degrees of freedom
# Null hypothesis probability = 9.909425e-01
Photon flux (15-150 keV) in 531.5 sec: 1.95412 ( -0.03432 0.03451 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.43751e-05 ( -1.1866e-06 1.18737e-06 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.816 sec. to 527.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.34046 ( -0.0276626 0.0552421 )
Epeak [keV] : 9998.78 ( -9999.29 -9999.29 )
Norm@50keV : 1.62850E-02 ( -0.000238793 0.000815327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.02 using 59 PHA bins.
# Reduced chi-squared = 0.6253 for 56 degrees of freedom
# Null hypothesis probability = 9.874280e-01
Photon flux (15-150 keV) in 531.5 sec: 1.05496 ( -0.060522 0.04154 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.43613e-05 ( -1.1881e-06 1.18346e-06 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 10.936 sec. to 11.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.02558 ( -0.0631034 0.0633522 )
Norm@50keV : 0.588910 ( -0.0220061 0.0219957 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.42 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 57 degrees of freedom
# Null hypothesis probability = 6.045939e-02
Photon flux (15-150 keV) in 1 sec: 2.39163 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.31204e-06 ( -2.59049e-07 2.59694e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.936 sec. to 11.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.663509 ( -0.251136 0.266226 )
Epeak [keV] : 214.739 ( -66.7397 321.716 )
Norm@50keV : 0.853391 ( -0.189165 0.25844 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.22 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 56 degrees of freedom
# Null hypothesis probability = 1.267865e-01
Photon flux (15-150 keV) in 1 sec: 67.1509 ( -2.6298 2.6306 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.36708e-07 ( -1.66673e-07 1.60607e-07 ) ergs/cm2
Time-resolved spectra
