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 -5.640 sec. to 465.080 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.8599 ( -0.138648 0.134976 )
Norm@50keV : 8.48462E-04 ( -7.21817e-05 7.11485e-05 )
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#Fit statistic : Chi-Squared = 60.19 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.610211e-01
Photon flux (15-150 keV) in 470.7 sec: 0.119750 ( -0.008637 0.008643 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.67235e-06 ( -3.09912e-07 3.1454e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.640 sec. to 465.080 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.47316 ( -0.473137 0.587533 )
Epeak [keV] : 59.3183 ( -14.4825 -59.3183 )
Norm@50keV : 1.39502E-03 ( -0.000592837 0.00155217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 56 degrees of freedom
# Null hypothesis probability = 3.811383e-01
Photon flux (15-150 keV) in 470.7 sec: 0.117434 ( -0.009159 0.009156 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5158e-06 ( -3.66281e-07 3.73973e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.828 sec. to 6.828 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.26709 ( -0.363537 0.364407 )
Norm@50keV : 7.79913E-03 ( -0.00153072 0.00152747 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.15 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.142794e-01
Photon flux (15-150 keV) in 1 sec: 0.925058 ( -0.184654 0.185242 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.77159e-08 ( -1.72208e-08 1.74738e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.828 sec. to 6.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.26288 ( -2.40989 1.63331 )
Epeak [keV] : 9996.89 ( -9997.37 -9997.37 )
Norm@50keV : 7.83364E-03 ( -0.00153989 0.0357947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.15 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 56 degrees of freedom
# Null hypothesis probability = 1.883474e-01
Photon flux (15-150 keV) in 1 sec: 0.926099 ( -0.195795 0.184491 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.76945e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
