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 -0.008 sec. to 0.124 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.627115 ( -0.167256 0.17249 )
Norm@50keV : 8.33937E-02 ( -0.0082124 0.00815019 )
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#Fit statistic : Chi-Squared = 42.92 using 59 PHA bins.
# Reduced chi-squared = 0.7530 for 57 degrees of freedom
# Null hypothesis probability = 9.165668e-01
Photon flux (15-150 keV) in 0.132 sec: 9.70602 ( -0.92069 0.92078 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38978e-07 ( -1.50967e-08 1.51797e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.618873 ( -0.168527 0.688478 )
Epeak [keV] : 9997.19 ( -9997.13 -9997.13 )
Norm@50keV : 8.40898E-02 ( -0.00814573 0.0782968 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.92 using 59 PHA bins.
# Reduced chi-squared = 0.7664 for 56 degrees of freedom
# Null hypothesis probability = 9.003662e-01
Photon flux (15-150 keV) in 0.132 sec: 9.70947 ( -0.93834 0.91663 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38942e-07 ( -1.55223e-08 1.32334e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.440 sec. to 0.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.788627 ( -0.270425 0.288334 )
Norm@50keV : 1.22994E-02 ( -0.00186797 0.00184657 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.98 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.186440e-01
Photon flux (15-150 keV) in 1 sec: 1.41419 ( -0.2097 0.21009 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44438e-07 ( -2.38567e-08 2.41552e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.440 sec. to 0.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.787786 ( -0.268114 0.2954 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.23854E-02 ( -0.0123935 0.0165172 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.99 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 56 degrees of freedom
# Null hypothesis probability = 1.921971e-01
Photon flux (15-150 keV) in 1 sec: 1.41757 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45355e-07 ( -2.92556e-08 2.13928e-08 ) ergs/cm2
Time-resolved spectra
