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 -0.016 sec. to 209.152 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.28632 ( -0.0511753 0.0514322 )
Norm@50keV : 3.05804E-03 ( -8.20517e-05 8.19197e-05 )
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#Fit statistic : Chi-Squared = 60.62 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.465409e-01
Photon flux (15-150 keV) in 209.2 sec: 0.363933 ( -0.010849 0.010905 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.34397e-06 ( -1.74445e-07 1.74441e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 209.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.28486 ( -0.0495712 0.0963314 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.06986E-03 ( -8.15895e-05 0.000356451 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.70 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 56 degrees of freedom
# Null hypothesis probability = 3.102847e-01
Photon flux (15-150 keV) in 209.2 sec: 0.366515 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.37238e-06 ( -2.04417e-07 1.44231e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.704 sec. to 3.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.06755 ( -0.0860947 0.0867257 )
Norm@50keV : 5.40202E-02 ( -0.00254025 0.00253676 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.35 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 57 degrees of freedom
# Null hypothesis probability = 4.620130e-01
Photon flux (15-150 keV) in 1 sec: 0.310206 0.271280 4.28812E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.70834e-07 ( -2.95689e-08 2.96757e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.704 sec. to 3.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.06361 ( -0.0853437 0.0886769 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 5.43260E-02 ( -0.00253382 0.0141642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.38 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 56 degrees of freedom
# Null hypothesis probability = 4.236283e-01
Photon flux (15-150 keV) in 1 sec: 6.27163 ( -0.3274 0.27686 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.72928e-07 ( -3.52033e-08 3.08121e-08 ) ergs/cm2
Time-resolved spectra
