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 0.276 sec. to 87.228 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.37166 ( -0.130307 0.130805 )
Norm@50keV : 2.28536E-03 ( -0.000174851 0.000174705 )
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#Fit statistic : Chi-Squared = 56.33 using 59 PHA bins.
# Reduced chi-squared = 0.9882 for 57 degrees of freedom
# Null hypothesis probability = 5.001910e-01
Photon flux (15-150 keV) in 86.95 sec: 0.276581 ( -0.021701 0.021739 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93179e-06 ( -1.62045e-07 1.63242e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.276 sec. to 87.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.706223 ( -0.552629 0.637726 )
Epeak [keV] : 99.3333 ( -26.4529 205.875 )
Norm@50keV : 4.87690E-03 ( -0.0022378 0.00500094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.01 using 59 PHA bins.
# Reduced chi-squared = 0.9288 for 56 degrees of freedom
# Null hypothesis probability = 6.264913e-01
Photon flux (15-150 keV) in 86.95 sec: 0.268384 ( -0.022855 0.022802 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83886e-06 ( -1.80957e-07 1.81316e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.984 sec. to 2.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.808829 ( -0.173414 0.181911 )
Norm@50keV : 2.04680E-02 ( -0.00214991 0.0021139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.50 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.310546e-01
Photon flux (15-150 keV) in 1 sec: 2.35171 ( -0.23927 0.24036 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38325e-07 ( -2.39718e-08 2.40183e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.984 sec. to 2.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.800945 ( -0.175457 0.572752 )
Epeak [keV] : 9997.64 ( -9998.23 -9998.23 )
Norm@50keV : 2.05945E-02 ( -0.00201415 0.0143313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.51 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 56 degrees of freedom
# Null hypothesis probability = 2.035585e-01
Photon flux (15-150 keV) in 1 sec: 2.35490 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3877e-07 ( -2.82953e-08 2.46144e-08 ) ergs/cm2
Time-resolved spectra
