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 -0.644 sec. to 12.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.08788 ( -0.198462 0.187755 )
Norm@50keV : 3.44525E-03 ( -0.000457922 0.000447201 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.70 using 59 PHA bins.
# Reduced chi-squared = 0.8895 for 57 degrees of freedom
# Null hypothesis probability = 7.089609e-01
Photon flux (15-150 keV) in 13.28 sec: 0.538853 ( -0.052789 0.052796 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24686e-07 ( -5.05086e-08 5.15779e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.644 sec. to 12.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.86177 ( -0.216086 0.769823 )
Epeak [keV] : 24.9544 ( )
Norm@50keV : 4.68165E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.37 using 59 PHA bins.
# Reduced chi-squared = 0.8994 for 56 degrees of freedom
# Null hypothesis probability = 6.871255e-01
Photon flux (15-150 keV) in 13.28 sec: 0.534402 ( -0.054324 0.053944 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.136 sec. to 0.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.15322 ( -0.228189 0.210152 )
Norm@50keV : 1.19360E-02 ( -0.00189673 0.00184138 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.66 using 59 PHA bins.
# Reduced chi-squared = 0.8537 for 57 degrees of freedom
# Null hypothesis probability = 7.762194e-01
Photon flux (15-150 keV) in 1 sec: 1.92890 ( -0.2211 0.22112 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11563e-07 ( -1.54549e-08 1.57492e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.136 sec. to 0.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.63596 ( -0.596757 0.990136 )
Epeak [keV] : 29.0950 ( -25.428 -29.0944 )
Norm@50keV : 2.40163E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.52 using 59 PHA bins.
# Reduced chi-squared = 0.8486 for 56 degrees of freedom
# Null hypothesis probability = 7.828199e-01
Photon flux (15-150 keV) in 1 sec: 1.90568 ( -0.22414 0.22412 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
