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 -0.688 sec. to 2.440 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.05009 ( -0.301953 0.276571 )
Norm@50keV : 3.62410E-03 ( -0.000811058 0.000798302 )
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#Fit statistic : Chi-Squared 60.53 using 59 bins.
Reduced chi-squared = 1.06193
# Null hypothesis probability of 3.50e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 3.128 sec: 0.556551 ( -0.093715 0.093749 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04859e-07 ( -2.14189e-08 2.22879e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.688 sec. to 2.440 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: 2.87834 ( -2.25735 5.24446 )
Epeak [keV] : 34.1068 ( -4.32279 5.63623 )
Norm@50keV : 5.12786 ( -4.84372 4453.52 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.62 using 59 bins.
Reduced chi-squared = 0.850357
# Null hypothesis probability of 7.80e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 3.128 sec: 0.524800 ( -0.091281 0.091813 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.14118e-08 ( -1.58038e-08 1.84333e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.144 sec. to 0.856 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.85172 ( -0.341741 0.313894 )
Norm@50keV : 5.91102E-03 ( -0.00142713 0.00139335 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 81.53 using 59 bins.
Reduced chi-squared = 1.43035
# Null hypothesis probability of 1.82e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.831487 ( -0.166777 0.166781 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.43526e-08 ( -1.28161e-08 1.32464e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.144 sec. to 0.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66898 ( -2.28661 5.48049 )
Epeak [keV] : 40.8684 ( -6.5207 11.007 )
Norm@50keV : 0.731618 ( -0.836631 1772.26 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 73.06 using 59 bins.
Reduced chi-squared = 1.30464
# Null hypothesis probability of 6.25e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.778478 ( -0.166525 0.167851 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.3443e-08 ( -1.03246e-08 1.25843e-08 ) ergs/cm2
Time-resolved spectra
