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 -4.516 sec. to 115.004 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.05709 ( -0.12247 0.119035 )
Norm@50keV : 2.21867E-03 ( -0.000173524 0.00017127 )
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#Fit statistic : Chi-Squared = 69.30 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 57 degrees of freedom
# Null hypothesis probability = 1.271279e-01
Photon flux (15-150 keV) in 119.5 sec: 0.341870 ( -0.021649 0.021667 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45459e-06 ( -1.76725e-07 1.78816e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.516 sec. to 115.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.52868 ( -0.490048 0.633019 )
Epeak [keV] : 36.2999 ( -32.0192 14.0978 )
Norm@50keV : 4.51442E-03 ( -0.00218143 0.00610071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.47 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 56 degrees of freedom
# Null hypothesis probability = 1.597806e-01
Photon flux (15-150 keV) in 119.5 sec: 0.333672 ( -0.023238 0.023143 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30988e-06 ( -2.22368e-07 2.28103e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 66.616 sec. to 67.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.03878 ( -0.384229 0.353454 )
Norm@50keV : 7.38764E-03 ( -0.00192383 0.00186068 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.425228e-01
Photon flux (15-150 keV) in 1 sec: 1.12846 ( -0.226721 0.22678 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.83015e-08 ( -1.61196e-08 1.673e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 66.616 sec. to 67.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.1161 ( -1.01197 5.44445 )
Epeak [keV] : 34.9837 ( )
Norm@50keV : 2.82761E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.22 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 56 degrees of freedom
# Null hypothesis probability = 4.297162e-01
Photon flux (15-150 keV) in 1 sec: 1.09983 ( -0.24205 0.23504 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.04338e-08 ( -2.01129e-08 2.1507e-08 ) ergs/cm2
Time-resolved spectra
