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 -150.512 sec. to 142.456 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.31194 ( -0.0447148 0.0448914 )
Norm@50keV : 3.47520E-03 ( -8.06226e-05 8.04914e-05 )
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#Fit statistic : Chi-Squared = 43.02 using 59 PHA bins.
# Reduced chi-squared = 0.7548 for 57 degrees of freedom
# Null hypothesis probability = 9.147888e-01
Photon flux (15-150 keV) in 293 sec: 0.415531 ( -0.010879 0.01094 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00341e-05 ( -2.35397e-07 2.35855e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -150.512 sec. to 142.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.30831 ( -0.0446366 0.0860053 )
Epeak [keV] : 9998.45 ( -9998.73 -9998.73 )
Norm@50keV : 3.48777E-03 ( -7.98153e-05 0.000411127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.08 using 59 PHA bins.
# Reduced chi-squared = 0.7692 for 56 degrees of freedom
# Null hypothesis probability = 8.972202e-01
Photon flux (15-150 keV) in 293 sec: 0.417582 ( -0.012861 0.00851 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00683e-05 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 33.676 sec. to 34.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.12602 ( -0.0672086 0.0674519 )
Norm@50keV : 4.94254E-02 ( -0.00185366 0.00185263 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.78 using 59 PHA bins.
# Reduced chi-squared = 0.9961 for 57 degrees of freedom
# Null hypothesis probability = 4.834575e-01
Photon flux (15-150 keV) in 1 sec: 5.74834 ( -0.22313 0.22337 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.12602e-07 ( -2.10834e-08 2.11383e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.676 sec. to 34.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.999772 ( -0.15649 0.262716 )
Epeak [keV] : 457.640 ( -457.64 -457.64 )
Norm@50keV : 5.62436E-02 ( -0.00812457 0.0167264 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.04 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.733915e-01
Photon flux (15-150 keV) in 1 sec: 2.18282 ( -0.29288 0.18276 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09753e-07 ( -2.19775e-08 2.19021e-08 ) ergs/cm2
Time-resolved spectra
