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 -1.396 sec. to 14.500 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.19533 ( -0.03261 0.0327138 )
Norm@50keV : 4.40528E-02 ( -0.000831142 0.00083034 )
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#Fit statistic : Chi-Squared = 89.32 using 59 PHA bins.
# Reduced chi-squared = 1.567 for 57 degrees of freedom
# Null hypothesis probability = 4.005498e-03
Photon flux (15-150 keV) in 15.9 sec: 5.16755 ( -0.10541 0.10562 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11651e-06 ( -1.34711e-07 1.34648e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.396 sec. to 14.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.638604 ( -0.145084 0.149632 )
Epeak [keV] : 148.019 ( -18.8199 30.419 )
Norm@50keV : 7.53269E-02 ( -0.00958646 0.0113054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.01 using 59 PHA bins.
# Reduced chi-squared = 0.7680 for 56 degrees of freedom
# Null hypothesis probability = 8.986093e-01
Photon flux (15-150 keV) in 15.9 sec: 5.00250 ( -0.11144 0.11185 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.98341e-06 ( -1.40871e-07 1.40646e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.880881 ( -0.046119 0.0464286 )
Norm@50keV : 0.157540 ( -0.00456945 0.00456319 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 101.11 using 59 PHA bins.
# Reduced chi-squared = 1.7738 for 57 degrees of freedom
# Null hypothesis probability = 2.893625e-04
Photon flux (15-150 keV) in 1 sec: 0.816720 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78148e-06 ( -5.4012e-08 5.4086e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.0604434 ( -0.212592 0.223225 )
Epeak [keV] : 142.642 ( -18.011 28.5389 )
Norm@50keV : 0.352741 ( -0.0644404 0.0824885 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.83 using 59 PHA bins.
# Reduced chi-squared = 0.9256 for 56 degrees of freedom
# Null hypothesis probability = 6.333080e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7515e-06 ( -5.63427e-08 5.62152e-08 ) ergs/cm2
Time-resolved spectra
