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 -0.044 sec. to 61.800 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.67437 ( -0.156142 0.152868 )
Norm@50keV : 1.37033E-03 ( -0.000129148 0.000127463 )
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#Fit statistic : Chi-Squared = 42.47 using 59 PHA bins.
# Reduced chi-squared = 0.7451 for 57 degrees of freedom
# Null hypothesis probability = 9.241716e-01
Photon flux (15-150 keV) in 61.84 sec: 0.180404 ( -0.015306 0.015313 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.86413e-07 ( -7.824e-08 7.94904e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.044 sec. to 61.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.35593 ( -0.501658 0.353242 )
Epeak [keV] : 92.2193 ( -36.6254 -92.2194 )
Norm@50keV : 2.04137E-03 ( -0.000775164 0.00254658 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.59 using 59 PHA bins.
# Reduced chi-squared = 0.7427 for 56 degrees of freedom
# Null hypothesis probability = 9.244095e-01
Photon flux (15-150 keV) in 61.84 sec: 0.177757 ( -0.016054 0.016022 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.60416e-07 ( -9.0655e-08 9.16432e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 48.140 sec. to 49.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.86537 ( -0.25023 0.234082 )
Norm@50keV : 6.03364E-03 ( -0.00105962 0.00103747 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.72 using 59 PHA bins.
# Reduced chi-squared = 0.8899 for 57 degrees of freedom
# Null hypothesis probability = 7.081593e-01
Photon flux (15-150 keV) in 1 sec: 0.853491 ( -0.121295 0.121295 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.54766e-08 ( -9.53353e-09 9.80638e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 48.140 sec. to 49.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.10112 ( -1.21342 1.68738 )
Epeak [keV] : 43.8269 ( -8.13608 15.562 )
Norm@50keV : 6.52538E-02 ( -0.0654319 0.605975 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.79 using 59 PHA bins.
# Reduced chi-squared = 0.7819 for 56 degrees of freedom
# Null hypothesis probability = 8.821913e-01
Photon flux (15-150 keV) in 1 sec: 0.819115 ( -0.121621 0.122296 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.80784e-08 ( -9.0213e-09 1.02675e-08 ) ergs/cm2
Time-resolved spectra
