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 0.024 sec. to 0.520 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.517363 ( -0.220921 0.237506 )
Norm@50keV : 2.19917E-02 ( -0.00312976 0.00304864 )
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#Fit statistic : Chi-Squared = 49.48 using 59 PHA bins.
# Reduced chi-squared = 0.8681 for 57 degrees of freedom
# Null hypothesis probability = 7.500172e-01
Photon flux (15-150 keV) in 0.496 sec: 2.59728 ( -0.32789 0.32888 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45282e-07 ( -1.88398e-08 1.891e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.024 sec. to 0.520 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: 0.0505499 ( -0.663161 1.17801 )
Epeak [keV] : 233.628 ( -233.628 -233.628 )
Norm@50keV : 3.65259E-02 ( -0.0166932 0.0596943 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.41 using 59 PHA bins.
# Reduced chi-squared = 0.8645 for 56 degrees of freedom
# Null hypothesis probability = 7.544951e-01
Photon flux (15-150 keV) in 0.496 sec: 2.55403 ( -0.3361 0.33647 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43288e-07 ( -1.98837e-08 1.95405e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.226 sec. to 0.774 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.590213 ( -0.266254 0.290641 )
Norm@50keV : 1.16605E-02 ( -0.00195042 0.00188626 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.49 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 57 degrees of freedom
# Null hypothesis probability = 2.313492e-01
Photon flux (15-150 keV) in 1 sec: 1.36306 ( -0.20363 0.20478 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49834e-07 ( -2.26185e-08 2.27259e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.226 sec. to 0.774 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.274266 ( -0.551878 1.31362 )
Epeak [keV] : 350.399 ( -350.4 -350.4 )
Norm@50keV : 1.55007E-02 ( -0.0155007 0.0302948 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.22 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.106920e-01
Photon flux (15-150 keV) in 1 sec: 1.34688 ( -0.20494 0.20848 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.51363e-10 ( 0 0 ) ergs/cm2
Time-resolved spectra
