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 17.648 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.75506 ( -0.193375 0.186115 )
Norm@50keV : 2.31946E-03 ( -0.00029207 0.000286854 )
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#Fit statistic : Chi-Squared = 61.54 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.167058e-01
Photon flux (15-150 keV) in 18.96 sec: 0.314232 ( -0.033755 0.033761 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0574e-07 ( -5.22981e-08 5.33398e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.312 sec. to 17.648 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.01715 ( -0.726132 0.896727 )
Epeak [keV] : 57.9984 ( -14.705 281.262 )
Norm@50keV : 6.03707E-03 ( -0.00362276 0.0133475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.50 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 56 degrees of freedom
# Null hypothesis probability = 3.837142e-01
Photon flux (15-150 keV) in 18.96 sec: 0.306195 ( -0.034584 0.034612 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77171e-07 ( -5.70398e-08 5.95943e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.164 sec. to 0.836 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.48142 ( -0.25787 0.252201 )
Norm@50keV : 8.23338E-03 ( -0.00133271 0.0013162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.81 using 59 PHA bins.
# Reduced chi-squared = 0.9616 for 57 degrees of freedom
# Null hypothesis probability = 5.576729e-01
Photon flux (15-150 keV) in 1 sec: 1.02282 ( -0.156266 0.15633 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.83592e-08 ( -1.38889e-08 1.41596e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.164 sec. to 0.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.723957 ( -0.877379 1.36073 )
Epeak [keV] : 77.8484 ( -25.7313 -77.8485 )
Norm@50keV : 2.11819E-02 ( -0.0211818 0.0962996 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.27 using 59 PHA bins.
# Reduced chi-squared = 0.9513 for 56 degrees of freedom
# Null hypothesis probability = 5.788264e-01
Photon flux (15-150 keV) in 1 sec: 0.998123 ( -0.160412 0.160177 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.29995e-08 ( -1.56367e-08 1.59739e-08 ) ergs/cm2
Time-resolved spectra
