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 -100.284 sec. to 116.504 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.79818 ( -0.0502721 0.0500969 )
Norm@50keV : 5.77844E-03 ( -0.000152588 0.000152443 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 77.92 using 59 bins.
Reduced chi-squared = 1.36702
# Null hypothesis probability of 3.43e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 216.8 sec: 0.795737 ( -0.023533 0.023632 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15356e-05 ( -3.08955e-07 3.09261e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -100.284 sec. to 116.504 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.48745 ( -0.207802 0.218308 )
Epeak [keV] : 84.5258 ( -15.801 64.2285 )
Norm@50keV : 8.17179E-03 ( -0.00165344 0.00220133 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 71.30 using 59 bins.
Reduced chi-squared = 1.27321
# Null hypothesis probability of 8.18e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 216.8 sec: 0.775883 ( -0.026628 0.026764 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12484e-05 ( -3.62591e-07 3.61289e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.25111 ( -0.122081 0.122523 )
Norm@50keV : 5.13301E-02 ( -0.00355076 0.00355032 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.36 using 59 bins.
Reduced chi-squared = 0.988772
# Null hypothesis probability of 4.99e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 6.07211 ( -0.43318 0.43406 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.13618e-07 ( -3.94634e-08 3.96429e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.247 ( -0.164423 0.323464 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.15632E-02 ( -0.00356581 0.0222606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.38 using 59 bins.
Reduced chi-squared = 1.00679
# Null hypothesis probability of 4.61e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 6.09513 ( -0.62592 0.57954 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61024e-07 ( -3.95957e-08 1.88465e-08 ) ergs/cm2
Time-resolved spectra
