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 -11.948 sec. to 165.008 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.62833 ( -0.0474909 0.0473648 )
Norm@50keV : 6.76467E-03 ( -0.000164195 0.000164175 )
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#Fit statistic : Chi-Squared = 45.63 using 59 PHA bins.
# Reduced chi-squared = 0.8006 for 57 degrees of freedom
# Null hypothesis probability = 8.602492e-01
Photon flux (15-150 keV) in 177 sec: 0.877128 ( -0.024537 0.024643 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11625e-05 ( -2.79425e-07 2.80021e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.948 sec. to 165.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.51801 ( -0.135973 0.186229 )
Epeak [keV] : 242.675 ( -117.72 -242.678 )
Norm@50keV : 7.58683E-03 ( -0.000933805 0.00157001 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.54 using 59 PHA bins.
# Reduced chi-squared = 0.7954 for 56 degrees of freedom
# Null hypothesis probability = 8.649266e-01
Photon flux (15-150 keV) in 177 sec: 0.868645 ( -0.027849 0.028013 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10796e-05 ( -3.10138e-07 3.09359e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 122.048 sec. to 123.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.30308 ( -0.0708966 0.0709804 )
Norm@50keV : 9.17034E-02 ( -0.00354666 0.00354663 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.24 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 57 degrees of freedom
# Null hypothesis probability = 3.264042e-01
Photon flux (15-150 keV) in 1 sec: 10.9468 ( -0.4478 0.4492 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.05628e-07 ( -3.81469e-08 3.82155e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 122.048 sec. to 123.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.29927 ( -0.112019 0.138045 )
Epeak [keV] : 9999.14 ( -9999.15 -9999.15 )
Norm@50keV : 9.20854E-02 ( -0.00356137 0.00918878 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.29 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 56 degrees of freedom
# Null hypothesis probability = 2.919058e-01
Photon flux (15-150 keV) in 1 sec: 11.0228 ( -0.5263 0.3708 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.10668e-07 ( -4.34066e-08 3.29148e-08 ) ergs/cm2
Time-resolved spectra
