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 -61.464 sec. to 70.504 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.24727 ( -0.169846 0.162086 )
Norm@50keV : 1.49768E-03 ( -0.000172585 0.000170176 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.76 using 59 bins.
Reduced chi-squared = 1.03088
# Null hypothesis probability of 4.11e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 132 sec: 0.254300 ( -0.019897 0.0199 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87242e-06 ( -1.78651e-07 1.83015e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -61.464 sec. to 70.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.23673 ( -0.295839 0.155172 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 1.50910E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.77 using 59 bins.
Reduced chi-squared = 1.04946
# Null hypothesis probability of 3.74e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 132 sec: 0.251149 ( -0.019426 0.019793 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80573e-06 ( -1.94258e-07 2.03516e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.036 sec. to 2.036 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.82478 ( -0.301435 0.279408 )
Norm@50keV : 9.05201E-03 ( -0.00190418 0.00185915 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.54 using 59 bins.
Reduced chi-squared = 1.02702
# Null hypothesis probability of 4.19e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.25960 ( -0.21941 0.21941 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.32818e-08 ( -1.73022e-08 1.78435e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.036 sec. to 2.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.352848 ( -1.22556 1.6833 )
Epeak [keV] : 47.0320 ( -11.6526 33.7496 )
Norm@50keV : 6.40774E-02 ( -0.0640766 0.579892 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.11 using 59 bins.
Reduced chi-squared = 0.96625
# Null hypothesis probability of 5.47e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.22302 ( -0.21797 0.21946 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.44132e-08 ( -1.67671e-08 1.86076e-08 ) ergs/cm2
Time-resolved spectra
