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 3.600 sec. to 81.552 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.60675 ( -0.516572 0.500654 )
Norm@50keV : 5.42055E-04 ( -0.000150132 0.000141117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.28 using 59 PHA bins.
# Reduced chi-squared = 0.7943 for 57 degrees of freedom
# Null hypothesis probability = 8.686642e-01
Photon flux (15-150 keV) in 77.95 sec: 6.98064E-02 ( -0.0172359 0.0172525 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94863e-07 ( -1.13798e-07 1.17015e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.600 sec. to 81.552 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.89965 ( -0.239943 1.60869 )
Epeak [keV] : 271.066 ( )
Norm@50keV : 1.24248E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.42 using 59 PHA bins.
# Reduced chi-squared = 0.7754 for 56 degrees of freedom
# Null hypothesis probability = 8.900495e-01
Photon flux (15-150 keV) in 77.95 sec: 5.01634E-02 ( -0.0302837 0.0212873 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49998e-07 ( -1.46856e-07 9.09715e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.644 sec. to 4.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.92433 ( -1.1767 0.990105 )
Norm@50keV : 2.49549E-03 ( -0.00249375 0.00131916 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.90 using 59 PHA bins.
# Reduced chi-squared = 0.9632 for 57 degrees of freedom
# Null hypothesis probability = 5.541346e-01
Photon flux (15-150 keV) in 1 sec: 0.361915 ( -0.149376 0.149385 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29372e-08 ( -1.19739e-08 1.32938e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.644 sec. to 4.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.29857 ( -0.431637 2.3996 )
Epeak [keV] : 359.785 ( )
Norm@50keV : 5.38378E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.00 using 59 PHA bins.
# Reduced chi-squared = 0.9644 for 56 degrees of freedom
# Null hypothesis probability = 5.507601e-01
Photon flux (15-150 keV) in 1 sec: 0.272235 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
