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 -0.808 sec. to 2.476 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.70715 ( -0.162475 0.159634 )
Norm@50keV : 1.10263E-02 ( -0.00108994 0.00107981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.78 using 59 PHA bins.
# Reduced chi-squared = 0.8733 for 57 degrees of freedom
# Null hypothesis probability = 7.402527e-01
Photon flux (15-150 keV) in 3.284 sec: 1.46815 ( -0.13996 0.14018 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35129e-07 ( -3.44015e-08 3.46508e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.808 sec. to 2.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.39945 ( -0.441351 0.728553 )
Epeak [keV] : 91.8287 ( )
Norm@50keV : 1.61102E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.11 using 59 PHA bins.
# Reduced chi-squared = 0.8769 for 56 degrees of freedom
# Null hypothesis probability = 7.312287e-01
Photon flux (15-150 keV) in 3.284 sec: 1.45181 ( -0.14426 0.14413 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27102e-07 ( -3.87299e-08 3.82852e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.90195 ( -0.231987 0.22144 )
Norm@50keV : 1.37613E-02 ( -0.00208173 0.00203684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.01 using 59 PHA bins.
# Reduced chi-squared = 1.316 for 57 degrees of freedom
# Null hypothesis probability = 5.514766e-02
Photon flux (15-150 keV) in 1 sec: 1.97665 ( -0.26014 0.26038 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26541e-07 ( -1.86364e-08 1.88877e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.0956 ( -1.38898 2.11783 )
Epeak [keV] : 46.2037 ( -38.8865 28.1223 )
Norm@50keV : 4.08369E-02 ( -0.0416796 0.759065 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.93 using 59 PHA bins.
# Reduced chi-squared = 1.320 for 56 degrees of freedom
# Null hypothesis probability = 5.454525e-02
Photon flux (15-150 keV) in 1 sec: 1.93014 ( -0.27954 0.27312 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
