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 -1.472 sec. to 35.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.09874 ( -0.0724535 0.0733605 )
Norm@50keV : 1.85515E-02 ( -0.000765325 0.000762752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9363 for 57 degrees of freedom
# Null hypothesis probability = 6.120264e-01
Photon flux (15-150 keV) in 37.33 sec: 2.15158 ( -0.09374 0.09409 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.24415e-06 ( -2.99536e-07 2.99962e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.472 sec. to 35.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.09762 ( -0.0700096 0.134159 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.86361E-02 ( -0.000766376 0.00333993 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.44 using 59 PHA bins.
# Reduced chi-squared = 0.9542 for 56 degrees of freedom
# Null hypothesis probability = 5.724894e-01
Photon flux (15-150 keV) in 37.33 sec: 2.16302 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.26789e-06 ( -3.24557e-07 2.74831e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.927833 ( -0.144951 0.147941 )
Norm@50keV : 6.87777E-02 ( -0.00620998 0.00618281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.57 using 59 PHA bins.
# Reduced chi-squared = 0.9924 for 57 degrees of freedom
# Null hypothesis probability = 4.912277e-01
Photon flux (15-150 keV) in 1 sec: 0.299959 0.224172 4.01286E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.63748e-07 ( -7.21559e-08 7.23939e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.012 sec. to 0.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.612723 ( -0.384724 0.609685 )
Epeak [keV] : 268.666 ( -268.456 -268.456 )
Norm@50keV : 9.38383E-02 ( -0.0295047 0.071717 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.60 using 59 PHA bins.
# Reduced chi-squared = 0.9928 for 56 degrees of freedom
# Null hypothesis probability = 4.901357e-01
Photon flux (15-150 keV) in 1 sec: 7.85098 ( -0.72062 0.72144 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61798e-07 ( -7.33994e-08 7.3228e-08 ) ergs/cm2
Time-resolved spectra
