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 -0.004 sec. to 66.064 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.02156 ( -0.0560931 0.0566251 )
Norm@50keV : 7.78814E-03 ( -0.000229702 0.000228897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.08 using 59 bins.
Reduced chi-squared = 1.12421
# Null hypothesis probability of 2.42e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 66.07 sec: 0.897754 ( -0.027529 0.027667 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52286e-06 ( -1.63734e-07 1.63888e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 66.064 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.01581 ( -0.0518268 0.0623647 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 7.83296E-03 ( -0.000230181 0.000218434 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.42 using 59 bins.
Reduced chi-squared = 1.15036
# Null hypothesis probability of 2.06e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 66.07 sec: 0.897421 ( -0.027565 0.02763 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.5495e-06 ( -1.92347e-07 1.35023e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.736 sec. to 2.736 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.471297 ( -0.152676 0.159473 )
Norm@50keV : 3.34853E-02 ( -0.00306073 0.00299067 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.85 using 59 bins.
Reduced chi-squared = 0.892105
# Null hypothesis probability of 7.04e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.380174 ( -0.148779 0.235892 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56562e-07 ( -3.7508e-08 3.76349e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.736 sec. to 2.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.461528 ( -0.153514 0.161847 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.37885E-02 ( -0.0028698 0.0169081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.88 using 59 bins.
Reduced chi-squared = 0.908571
# Null hypothesis probability of 6.69e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 3.99308 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56825e-07 ( -4.13834e-08 4.08319e-08 ) ergs/cm2
Time-resolved spectra
