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 -9.096 sec. to 336.016 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.12205 ( -0.239003 0.222873 )
Norm@50keV : 4.75003E-04 ( -7.00686e-05 6.74977e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.92 using 59 PHA bins.
# Reduced chi-squared = 0.9810 for 57 degrees of freedom
# Null hypothesis probability = 5.157344e-01
Photon flux (15-150 keV) in 345.1 sec: 7.55604E-02 ( -0.008128 0.008143 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52674e-06 ( -1.95198e-07 1.99555e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.096 sec. to 336.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.37555 ( -0.0164401 0.421146 )
Epeak [keV] : 146.443 ( )
Norm@50keV : 3.55852E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.51 using 59 PHA bins.
# Reduced chi-squared = 0.9912 for 56 degrees of freedom
# Null hypothesis probability = 4.934430e-01
Photon flux (15-150 keV) in 345.1 sec: 7.08647E-02 ( -0.0168517 0.0127907 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3635e-06 ( -5.27503e-07 3.66137e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 98.784 sec. to 99.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.895164 ( -0.784762 1.07696 )
Norm@50keV : 3.24353E-03 ( -0.00155097 0.00115456 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.42 using 59 PHA bins.
# Reduced chi-squared = 0.8144 for 57 degrees of freedom
# Null hypothesis probability = 8.403919e-01
Photon flux (15-150 keV) in 1 sec: 0.371987 ( -0.371987 0.143175 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6488e-08 ( -1.21234e-08 1.20386e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 98.784 sec. to 99.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.943898 ( -0.737217 1.14874 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.30626E-03 ( -0.00159832 0.00394005 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.46 using 59 PHA bins.
# Reduced chi-squared = 0.8296 for 56 degrees of freedom
# Null hypothesis probability = 8.145607e-01
Photon flux (15-150 keV) in 1 sec: 0.142537 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04263e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
