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 0.632 sec. to 96.632 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.27997 ( -0.335135 0.341553 )
Norm@50keV : 8.39768E-04 ( -0.000157072 0.000156812 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.76 using 59 bins.
Reduced chi-squared = 1.04842
# Null hypothesis probability of 3.76e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 96 sec: 9.98271E-02 ( -0.0190271 0.0191009 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.00702e-07 ( -1.67356e-07 1.70235e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.632 sec. to 96.632 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.04314 ( -1.74586 1.29935 )
Epeak [keV] : 212.681 ( -293.15 -293.15 )
Norm@50keV : 1.09387E-03 ( -0.000284849 0.00299583 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.74 using 59 bins.
Reduced chi-squared = 1.06679
# Null hypothesis probability of 3.42e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 96 sec: 9.92000E-02 ( -0.0197226 0.019525 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.93051e-07 ( -1.79782e-07 1.75586e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.132 sec. to 9.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.67846 ( -1.34937 1.39518 )
Norm@50keV : 2.40740E-03 ( -0.00176941 0.00170942 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.90 using 59 bins.
Reduced chi-squared = 1.01579
# Null hypothesis probability of 4.42e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.317387 ( -0.207242 0.20798 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23254e-08 ( -1.57058e-08 1.79463e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.132 sec. to 9.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 9.80268 ( )
Epeak [keV] : 34.7778 ( )
Norm@50keV : 5.10085E+04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.69 using 59 bins.
Reduced chi-squared = 0.95875
# Null hypothesis probability of 5.63e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.291972 ( -0.145799 0.178887 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5056e-08 ( -7.46987e-09 8.87936e-09 ) ergs/cm2
Time-resolved spectra
