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 0.000 sec. to 0.016 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -6.7714 ( 6.73121 1.37875 )
Norm@50keV : 3.27111E-04 ( -0.000354862 0.00107017 )
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#Fit statistic : Chi-Squared = 69.36 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.262406e-01
Photon flux (15-150 keV) in 0.016 sec: 3.01930 ( -2.20894 2.20708 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40935e-09 ( -1.05665e-09 1.06584e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.016 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1 ( 1 1 )
Epeak [keV] : 80.0000 ( -80 -80 )
Norm@50keV : 0.0 ( )
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#Fit statistic : Chi-Squared = 74.90 using 59 PHA bins.
# Reduced chi-squared = 1.337 for 56 degrees of freedom
# Null hypothesis probability = 4.662137e-02
Photon flux (15-150 keV) in 0.016 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.3919 ( -0.614947 0.647193 )
Norm@50keV : 6.26255E-03 ( -0.00225817 0.00225796 )
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#Fit statistic : Chi-Squared = 40.50 using 59 PHA bins.
# Reduced chi-squared = 0.7104 for 57 degrees of freedom
# Null hypothesis probability = 9.518064e-01
Photon flux (15-150 keV) in 1 sec: 0.761273 ( -0.289667 0.294997 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.0622e-08 ( -2.28343e-08 2.31676e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.588143 ( -6.03431 3.35915 )
Epeak [keV] : 96.5538 ( -96.4568 -96.4568 )
Norm@50keV : 1.47844E-02 ( -0.0148191 0.399347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.06 using 59 PHA bins.
# Reduced chi-squared = 0.7154 for 56 degrees of freedom
# Null hypothesis probability = 9.467490e-01
Photon flux (15-150 keV) in 1 sec: 0.733970 ( -0.298857 0.30347 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.85262e-08 ( -2.32729e-08 2.38288e-08 ) ergs/cm2
Time-resolved spectra
