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 -3.052 sec. to 7.532 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.08201 ( -0.0425053 0.0426832 )
Norm@50keV : 2.10697E-02 ( -0.000479065 0.000477953 )
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#Fit statistic : Chi-Squared = 32.74 using 59 PHA bins.
# Reduced chi-squared = 0.5744 for 57 degrees of freedom
# Null hypothesis probability = 9.959144e-01
Photon flux (15-150 keV) in 10.58 sec: 2.43986 ( -0.05832 0.05849 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.34448e-06 ( -5.50014e-08 5.50521e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.052 sec. to 7.532 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.07778 ( -0.0415905 0.0442974 )
Epeak [keV] : 9992.03 ( -9989.11 -9989.11 )
Norm@50keV : 2.11922E-02 ( -0.000477482 0.00479523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.69 using 59 PHA bins.
# Reduced chi-squared = 0.5838 for 56 degrees of freedom
# Null hypothesis probability = 9.945901e-01
Photon flux (15-150 keV) in 10.58 sec: 2.43343 ( -0.06708 0.05932 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33709e-06 ( -5.76109e-08 6.11665e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.356 sec. to 0.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.767647 ( -0.0522742 0.0526889 )
Norm@50keV : 7.31767E-02 ( -0.00216072 0.00215139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.82 using 59 PHA bins.
# Reduced chi-squared = 0.6283 for 57 degrees of freedom
# Null hypothesis probability = 9.873832e-01
Photon flux (15-150 keV) in 1 sec: 0.613032 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.67062e-07 ( -2.708e-08 2.7149e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.356 sec. to 0.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.690465 ( -0.0963529 0.198723 )
Epeak [keV] : 997.891 ( -999.553 -999.553 )
Norm@50keV : 7.91022E-02 ( -0.00222299 0.0155895 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.54 using 59 PHA bins.
# Reduced chi-squared = 0.6346 for 56 degrees of freedom
# Null hypothesis probability = 9.850723e-01
Photon flux (15-150 keV) in 1 sec: 8.40468 ( -0.2566 0.24385 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.64848e-07 ( -2.86291e-08 2.589e-08 ) ergs/cm2
Time-resolved spectra
