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 -1.000 sec. to 45.404 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.53107 ( -0.0350865 0.0351021 )
Norm@50keV : 1.97015E-02 ( -0.00035265 0.000352528 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 41.15 using 59 bins.
Reduced chi-squared = 0.72193
# Null hypothesis probability of 9.44e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 46.4 sec: 2.48072 ( -0.05296 0.05318 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.63096e-06 ( -1.5599e-07 1.5599e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.000 sec. to 45.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.45493 ( -0.103675 0.141735 )
Epeak [keV] : 413.608 ( -413.836 -413.836 )
Norm@50keV : 2.12571E-02 ( -0.0020298 0.00314021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 40.28 using 59 bins.
Reduced chi-squared = 0.719286
# Null hypothesis probability of 9.44e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 46.4 sec: 2.46323 ( -0.061 0.05837 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58952e-06 ( -1.72703e-07 1.62895e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 26.776 sec. to 27.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.36153 ( -0.0576387 0.0575079 )
Norm@50keV : 9.68560E-02 ( -0.00310641 0.00310582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 60.76 using 59 bins.
Reduced chi-squared = 1.06596
# Null hypothesis probability of 3.42e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 11.6966 ( -0.3906 0.391 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.4367e-07 ( -3.33166e-08 3.33872e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.776 sec. to 27.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.04693 ( -0.229065 0.241444 )
Epeak [keV] : 164.371 ( -48.7248 266.659 )
Norm@50keV : 0.136028 ( -0.0291182 0.0394046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.17 using 59 bins.
Reduced chi-squared = 0.985179
# Null hypothesis probability of 5.06e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 11.5002 ( -0.4137 0.4142 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.25785e-07 ( -3.62153e-08 3.60266e-08 ) ergs/cm2
Time-resolved spectra
