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 0.196 sec. to 2.932 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.40144 ( -0.210199 0.209397 )
Norm@50keV : 9.21022E-03 ( -0.00126762 0.0012641 )
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#Fit statistic : Chi-Squared 54.65 using 59 bins.
Reduced chi-squared = 0.958772
# Null hypothesis probability of 5.64e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 2.736 sec: 1.12203 ( -0.154298 0.15456 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43442e-07 ( -3.63967e-08 3.6782e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.196 sec. to 2.932 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: 0.677504 ( -1.22073 1.77143 )
Epeak [keV] : 63.1787 ( -10.6464 24.4082 )
Norm@50keV : 0.104702 ( -0.104718 0.692852 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.26 using 59 bins.
Reduced chi-squared = 0.790357
# Null hypothesis probability of 8.72e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 2.736 sec: 1.05189 ( -0.161075 0.16068 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14633e-07 ( -3.79453e-08 4.00829e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.496 sec. to 1.496 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.44404 ( -0.291337 0.286498 )
Norm@50keV : 1.07037E-02 ( -0.00210759 0.00209862 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.40 using 59 bins.
Reduced chi-squared = 1.11228
# Null hypothesis probability of 2.61e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.31709 ( -0.25746 0.25794 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0257e-07 ( -2.16436e-08 2.19331e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.496 sec. to 1.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.610635 ( -1.51318 2.4589 )
Epeak [keV] : 61.2124 ( -13.3617 42.1045 )
Norm@50keV : 0.124388 ( -0.125894 2.14179 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.22 using 59 bins.
Reduced chi-squared = 1.02179
# Null hypothesis probability of 4.30e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.25430 ( -0.263157 0.26357 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.12935e-08 ( -2.21868e-08 2.38448e-08 ) ergs/cm2
Time-resolved spectra
