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 -3.320 sec. to 31.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.8258 ( -0.281262 0.270711 )
Norm@50keV : 2.00366E-03 ( -0.000330858 0.000323488 )
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#Fit statistic : Chi-Squared = 43.80 using 59 PHA bins.
# Reduced chi-squared = 0.7684 for 57 degrees of freedom
# Null hypothesis probability = 9.003222e-01
Photon flux (15-150 keV) in 35.26 sec: 0.278925 ( -0.042983 0.043198 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.49997e-07 ( -1.06881e-07 1.0834e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.320 sec. to 31.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.75691 ( -0.878384 1.18519 )
Epeak [keV] : 163.936 ( -165.816 -165.902 )
Norm@50keV : 2.18207E-03 ( -0.00136867 0.00717879 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.79 using 59 PHA bins.
# Reduced chi-squared = 0.7819 for 56 degrees of freedom
# Null hypothesis probability = 8.822538e-01
Photon flux (15-150 keV) in 35.26 sec: 0.278069 ( -0.044812 0.043813 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.46206e-07 ( -1.21566e-07 1.11031e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.62162 ( -0.377977 0.366727 )
Norm@50keV : 8.24701E-03 ( -0.00195057 0.00193854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.38 using 59 PHA bins.
# Reduced chi-squared = 0.7083 for 57 degrees of freedom
# Null hypothesis probability = 9.532043e-01
Photon flux (15-150 keV) in 1 sec: 1.06702 ( -0.257723 0.25991 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.69449e-08 ( -1.88364e-08 1.90062e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.134342 ( -1.52891 2.21465 )
Epeak [keV] : 66.5915 ( -18.8571 1144.87 )
Norm@50keV : 4.24501E-02 ( -0.0424277 0.369418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.64 using 59 PHA bins.
# Reduced chi-squared = 0.6721 for 56 degrees of freedom
# Null hypothesis probability = 9.717642e-01
Photon flux (15-150 keV) in 1 sec: 1.00465 ( -0.264071 0.2678 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.3156e-08 ( -1.87396e-08 1.93479e-08 ) ergs/cm2
Time-resolved spectra
