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 -1.312 sec. to 14.368 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.49329 ( -0.141898 0.14093 )
Norm@50keV : 8.12291E-03 ( -0.000680606 0.000678017 )
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#Fit statistic : Chi-Squared = 54.93 using 59 PHA bins.
# Reduced chi-squared = 0.9638 for 57 degrees of freedom
# Null hypothesis probability = 5.529803e-01
Photon flux (15-150 keV) in 15.68 sec: 1.01226 ( -0.084713 0.08482 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20978e-06 ( -1.10353e-07 1.112e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.312 sec. to 14.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.19687 ( -0.369741 0.610924 )
Epeak [keV] : 135.409 ( -61.3085 -135.42 )
Norm@50keV : 1.15021E-02 ( -0.0039145 0.0116416 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.09 using 59 PHA bins.
# Reduced chi-squared = 0.9659 for 56 degrees of freedom
# Null hypothesis probability = 5.475491e-01
Photon flux (15-150 keV) in 15.68 sec: 1.00055 ( -0.087564 0.08748 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1842e-06 ( -1.21709e-07 1.20724e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.096 sec. to 2.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.09966 ( -0.279617 0.290242 )
Norm@50keV : 1.72483E-02 ( -0.00276909 0.00276043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.35 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.348955e-01
Photon flux (15-150 keV) in 1 sec: 2.00062 ( -0.33115 0.33288 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80372e-07 ( -3.11338e-08 3.13568e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.096 sec. to 2.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.02645 ( )
Epeak [keV] : 9.66330 ( )
Norm@50keV : 3.46717E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.27 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 56 degrees of freedom
# Null hypothesis probability = 2.094573e-01
Photon flux (15-150 keV) in 1 sec: 1.98973 ( -0.33994 0.32511 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79374e-07 ( -3.22952e-08 3.09409e-08 ) ergs/cm2
Time-resolved spectra
