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 0.152 sec. to 27.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.42939 ( -0.0628625 0.0629735 )
Norm@50keV : 1.57204E-02 ( -0.000552818 0.00055273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9188 for 57 degrees of freedom
# Null hypothesis probability = 6.490061e-01
Photon flux (15-150 keV) in 27.47 sec: 1.92766 ( -0.07495 0.07518 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14896e-06 ( -1.51733e-07 1.51934e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.152 sec. to 27.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.16202 ( -0.248104 0.2625 )
Epeak [keV] : 178.253 ( -60.8911 1069.03 )
Norm@50keV : 2.07227E-02 ( -0.00456408 0.00623634 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.99 using 59 PHA bins.
# Reduced chi-squared = 0.8748 for 56 degrees of freedom
# Null hypothesis probability = 7.352638e-01
Photon flux (15-150 keV) in 27.47 sec: 1.89623 ( -0.0799 0.08031 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.09957e-06 ( -1.59636e-07 1.59148e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.692 sec. to 2.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.22966 ( -0.0430742 0.0431811 )
Norm@50keV : 0.325954 ( -0.00835745 0.00835286 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.65 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.146372e-01
Photon flux (15-150 keV) in 1 sec: 1.06565 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.28027e-06 ( -8.69679e-08 8.7016e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.692 sec. to 2.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.739282 ( -0.182245 0.189512 )
Epeak [keV] : 152.383 ( -26.4765 53.6952 )
Norm@50keV : 0.532085 ( -0.0864665 0.107242 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.28 using 59 PHA bins.
# Reduced chi-squared = 0.6479 for 56 degrees of freedom
# Null hypothesis probability = 9.810974e-01
Photon flux (15-150 keV) in 1 sec: 37.5956 ( -1.0861 1.0888 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
