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 -0.004 sec. to 0.036 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.25177 ( -0.254431 0.241358 )
Norm@50keV : 5.28441E-02 ( -0.0104773 0.0104489 )
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#Fit statistic : Chi-Squared = 80.98 using 59 PHA bins.
# Reduced chi-squared = 1.421 for 57 degrees of freedom
# Null hypothesis probability = 2.011205e-02
Photon flux (15-150 keV) in 0.04 sec: 6.25207 ( -1.22453 1.22483 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11407e-08 ( -4.56624e-09 4.5952e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.65461 ( -1.84252 3.67958 )
Epeak [keV] : 74.3311 ( -8.85621 12.1822 )
Norm@50keV : 2.24508 ( -2.31513 31.4328 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.43 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 56 degrees of freedom
# Null hypothesis probability = 3.188937e-01
Photon flux (15-150 keV) in 0.04 sec: 6.59139 ( -1.24979 1.24642 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47292e-09 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.532705 ( -0.463379 0.537868 )
Norm@50keV : 4.04842E-03 ( -0.00140515 0.00136367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.63 using 59 PHA bins.
# Reduced chi-squared = 1.292 for 57 degrees of freedom
# Null hypothesis probability = 6.829240e-02
Photon flux (15-150 keV) in 1 sec: 0.476618 ( -0.144011 0.148278 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35279e-08 ( -1.54239e-08 1.55183e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 9.99782 ( -5.56649 -9.99932 )
Epeak [keV] : 83.4911 ( -8.87571 10.7795 )
Norm@50keV : 5.56217 ( -5.53748 2.52581 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.81 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.477025e-01
Photon flux (15-150 keV) in 1 sec: 0.373114 ( -0.085995 0.105048 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50402e-08 ( -1.0843e-08 1.4761e-08 ) ergs/cm2
Time-resolved spectra
