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 0.000 sec. to 2.624 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.1784 ( -0.417943 0.442369 )
Norm@50keV : 4.56437E-03 ( -0.00126555 0.00126488 )
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#Fit statistic : Chi-Squared = 80.36 using 59 PHA bins.
# Reduced chi-squared = 1.410 for 57 degrees of freedom
# Null hypothesis probability = 2.243748e-02
Photon flux (15-150 keV) in 2.624 sec: 0.534039 ( -0.151215 0.152374 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22336e-07 ( -3.60472e-08 3.68205e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.624 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: 7.31695 ( -5.33921 -7.29344 )
Epeak [keV] : 49.1694 ( -6.3671 9.45293 )
Norm@50keV : 119.105 ( -112.605 3315.6 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.95 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 56 degrees of freedom
# Null hypothesis probability = 9.950245e-02
Photon flux (15-150 keV) in 2.624 sec: 0.430749 ( -0.119712 0.142814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88701e-08 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.124 sec. to 0.876 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.76937 ( -0.39664 0.453131 )
Norm@50keV : 9.03386E-03 ( -0.00232574 0.00225487 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.42 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 57 degrees of freedom
# Null hypothesis probability = 6.047521e-02
Photon flux (15-150 keV) in 1 sec: 1.03960 ( -0.253276 0.25601 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06962e-07 ( -2.6218e-08 2.64792e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.124 sec. to 0.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.581714 ( -1.5321 7.59687 )
Epeak [keV] : 102.085 ( -36.0124 -101.844 )
Norm@50keV : 3.93504E-02 ( -0.0396569 107.46 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.36 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 56 degrees of freedom
# Null hypothesis probability = 5.964644e-02
Photon flux (15-150 keV) in 1 sec: 0.986669 ( -0.306801 0.272741 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.54817e-08 ( -4.24897e-08 3.30263e-08 ) ergs/cm2
Time-resolved spectra
