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 25.172 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.02904 ( -0.0753727 0.0762856 )
Norm@50keV : 6.98669E-03 ( -0.000291331 0.000290181 )
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#Fit statistic : Chi-Squared = 43.24 using 59 PHA bins.
# Reduced chi-squared = 0.7585 for 57 degrees of freedom
# Null hypothesis probability = 9.109330e-01
Photon flux (15-150 keV) in 25.17 sec: 0.805751 ( -0.034611 0.034711 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88262e-06 ( -8.21639e-08 8.23348e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 25.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.921784 ( -0.0996094 0.308765 )
Epeak [keV] : 553.740 ( -715.575 -934.751 )
Norm@50keV : 7.77335E-03 ( -0.000667132 0.00247731 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.31 using 59 PHA bins.
# Reduced chi-squared = 0.7734 for 56 degrees of freedom
# Null hypothesis probability = 8.924478e-01
Photon flux (15-150 keV) in 25.17 sec: 0.803044 ( -0.036503 0.034849 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87674e-06 ( -8.64464e-08 8.32065e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.340 sec. to 4.340 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.80617 ( -0.140903 0.144925 )
Norm@50keV : 1.83934E-02 ( -0.00148872 0.0014784 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.77 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.763943e-01
Photon flux (15-150 keV) in 1 sec: 2.11352 ( -0.16781 0.16808 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14408e-07 ( -1.83475e-08 1.84494e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.340 sec. to 4.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.805125 ( -0.138285 0.176548 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.85342E-02 ( -0.00152884 0.0106953 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.79 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 56 degrees of freedom
# Null hypothesis probability = 1.532859e-01
Photon flux (15-150 keV) in 1 sec: 2.11719 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33854e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
