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 -0.004 sec. to 0.064 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.20996 ( -0.341635 0.354765 )
Norm@50keV : 2.43073E-02 ( -0.00502439 0.00502436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.19 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.132764e-01
Photon flux (15-150 keV) in 0.068 sec: 2.85726 ( -0.6059 0.60728 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67243e-08 ( -3.7833e-09 3.8208e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.925099 ( )
Epeak [keV] : 196.187 ( )
Norm@50keV : 3.37255E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.06 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 56 degrees of freedom
# Null hypothesis probability = 1.905073e-01
Photon flux (15-150 keV) in 0.068 sec: 2.83812 ( -0.61398 0.61361 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6444e-08 ( -4.15638e-09 3.98411e-09 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.468 sec. to 0.532 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.928029 ( -0.659869 0.780344 )
Norm@50keV : 2.70021E-03 ( -0.00106364 0.00100107 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.02 using 59 PHA bins.
# Reduced chi-squared = 0.8776 for 57 degrees of freedom
# Null hypothesis probability = 7.320126e-01
Photon flux (15-150 keV) in 1 sec: 0.310049 ( -0.116531 0.118396 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99826e-08 ( -1.13265e-08 1.14985e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.468 sec. to 0.532 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.35261 ( )
Epeak [keV] : 111.454 ( )
Norm@50keV : 2.10354E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.61 using 59 PHA bins.
# Reduced chi-squared = 0.8859 for 56 degrees of freedom
# Null hypothesis probability = 7.139123e-01
Photon flux (15-150 keV) in 1 sec: 0.310120 ( -0.120041 0.11788 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99889e-08 ( -1.18838e-08 1.07051e-08 ) ergs/cm2
Time-resolved spectra
