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 -7.632 sec. to 41.712 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.39782 ( -0.149105 0.149704 )
Norm@50keV : 4.03079E-03 ( -0.000343888 0.000343714 )
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#Fit statistic : Chi-Squared 45.43 using 59 bins.
Reduced chi-squared = 0.797018
# Null hypothesis probability of 8.65e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 49.34 sec: 0.490641 ( -0.044052 0.044211 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92278e-06 ( -1.76398e-07 1.77606e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.632 sec. to 41.712 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.858418 ( -0.588795 0.698003 )
Epeak [keV] : 113.077 ( -36.511 -113.077 )
Norm@50keV : 7.26757E-03 ( -0.00335477 0.007893 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.11 using 59 bins.
Reduced chi-squared = 0.769821
# Null hypothesis probability of 8.96e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 49.34 sec: 0.477099 ( -0.046622 0.046694 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8599e-06 ( -1.92844e-07 1.92018e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.156 sec. to 5.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.45072 ( -0.501076 0.494696 )
Norm@50keV : 8.19293E-03 ( -0.0023827 0.00237448 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 71.48 using 59 bins.
Reduced chi-squared = 1.25404
# Null hypothesis probability of 9.38e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.00987 ( -0.301973 0.30417 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84007e-08 ( -2.43016e-08 2.46498e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.156 sec. to 5.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.53494 ( -1.75804 5.21643 )
Epeak [keV] : 83.4294 ( -36.4004 -83.0804 )
Norm@50keV : 2.28770E-02 ( -0.0231729 5.33866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 71.07 using 59 bins.
Reduced chi-squared = 1.26911
# Null hypothesis probability of 8.45e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.972587 ( -0.340205 0.320223 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.45659e-08 ( -2.71483e-08 2.66853e-08 ) ergs/cm2
Time-resolved spectra
