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 -6.560 sec. to 167.624 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.18923 ( -0.11758 0.11918 )
Norm@50keV : 1.16479E-03 ( -7.26351e-05 7.25763e-05 )
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#Fit statistic : Chi-Squared = 50.59 using 59 PHA bins.
# Reduced chi-squared = 0.8875 for 57 degrees of freedom
# Null hypothesis probability = 7.127821e-01
Photon flux (15-150 keV) in 174.2 sec: 0.136520 ( -0.008925 0.008963 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06509e-06 ( -1.41252e-07 1.41992e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.560 sec. to 167.624 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.19069 ( -0.113133 0.142252 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.17057E-03 ( -7.26962e-05 0.000252649 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.64 using 59 PHA bins.
# Reduced chi-squared = 0.9043 for 56 degrees of freedom
# Null hypothesis probability = 6.771446e-01
Photon flux (15-150 keV) in 174.2 sec: 0.137537 ( -0.009985 0.007905 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07605e-06 ( -1.53095e-07 1.30272e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.584 sec. to 9.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.086 ( -0.344173 0.36562 )
Norm@50keV : 6.01794E-03 ( -0.00114706 0.00114223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.98 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 57 degrees of freedom
# Null hypothesis probability = 1.328472e-01
Photon flux (15-150 keV) in 1 sec: 0.697125 ( -0.136766 0.137229 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.32092e-08 ( -1.30836e-08 1.32043e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.584 sec. to 9.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.32411 ( -4.70735 2.13114 )
Epeak [keV] : 107.812 ( )
Norm@50keV : 9.09094E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.58 using 59 PHA bins.
# Reduced chi-squared = 1.225 for 56 degrees of freedom
# Null hypothesis probability = 1.206239e-01
Photon flux (15-150 keV) in 1 sec: 0.701857 ( -0.162086 0.153006 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.35214e-08 ( -1.52622e-08 1.47837e-08 ) ergs/cm2
Time-resolved spectra
