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 -0.448 sec. to 14.440 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.61464 ( -0.0928269 0.0907473 )
Norm@50keV : 8.45571E-03 ( -0.000496315 0.000493648 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 73.23 using 59 bins.
Reduced chi-squared = 1.28474
# Null hypothesis probability of 7.25e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 14.89 sec: 1.78525 ( -0.07893 0.07927 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30225e-06 ( -5.57441e-08 5.59833e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.448 sec. to 14.440 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.61872 ( -0.453431 0.503209 )
Epeak [keV] : 14.3636 ( -13.4918 8.01361 )
Norm@50keV : 3.36059E-02 ( -0.0143037 0.0341496 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.45 using 59 bins.
Reduced chi-squared = 1.00804
# Null hypothesis probability of 4.58e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 14.89 sec: 1.68491 ( -0.0887 0.08896 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18463e-06 ( -6.74253e-08 7.00789e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.868 sec. to 4.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.21733 ( -0.111359 0.107825 )
Norm@50keV : 2.84293E-02 ( -0.00216059 0.002137 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 87.45 using 59 bins.
Reduced chi-squared = 1.53421
# Null hypothesis probability of 5.86e-03 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 4.75037 ( -0.29169 0.29195 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68022e-07 ( -1.78838e-08 1.80135e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.868 sec. to 4.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.04672 ( -0.549181 0.635506 )
Epeak [keV] : 32.6366 ( -7.91486 4.83152 )
Norm@50keV : 0.139500 ( -0.0729389 0.19537 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 72.16 using 59 bins.
Reduced chi-squared = 1.28857
# Null hypothesis probability of 7.18e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 4.57746 ( -0.3009 0.30132 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44861e-07 ( -1.93073e-08 1.99646e-08 ) ergs/cm2
Time-resolved spectra
