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 -6.264 sec. to 8.596 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.19018 ( -0.165057 0.168119 )
Norm@50keV : 5.18815E-03 ( -0.00050948 0.000509456 )
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#Fit statistic : Chi-Squared = 55.25 using 59 PHA bins.
# Reduced chi-squared = 0.9693 for 57 degrees of freedom
# Null hypothesis probability = 5.409581e-01
Photon flux (15-150 keV) in 14.86 sec: 0.608158 ( -0.061497 0.061619 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84439e-07 ( -8.45179e-08 8.51e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.264 sec. to 8.596 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.621716 ( -0.616363 0.725539 )
Epeak [keV] : 129.203 ( -45.9238 -129.204 )
Norm@50keV : 9.71774E-03 ( -0.00466617 0.0112431 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.79 using 59 PHA bins.
# Reduced chi-squared = 0.9427 for 56 degrees of freedom
# Null hypothesis probability = 5.970163e-01
Photon flux (15-150 keV) in 14.86 sec: 0.594823 ( -0.063271 0.063317 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.56482e-07 ( -9.15174e-08 9.11133e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.428 sec. to 4.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.916966 ( -0.35264 0.382405 )
Norm@50keV : 8.76187E-03 ( -0.00200981 0.00197996 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.35 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.557857e-01
Photon flux (15-150 keV) in 1 sec: 1.00584 ( -0.228813 0.23133 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.77035e-08 ( -2.2156e-08 2.23127e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.428 sec. to 4.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02129 ( -1.80683 3.06491 )
Epeak [keV] : 92.9687 ( -25.0582 323.748 )
Norm@50keV : 5.57887E-02 ( -0.0564623 0.729201 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.90 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 56 degrees of freedom
# Null hypothesis probability = 4.414218e-01
Photon flux (15-150 keV) in 1 sec: 0.929085 ( -0.235516 0.241975 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.04191e-08 ( -2.33133e-08 2.38082e-08 ) ergs/cm2
Time-resolved spectra
