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 -24.032 sec. to 13.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.64417 ( -0.169438 0.167232 )
Norm@50keV : 6.19071E-03 ( -0.000596224 0.000591938 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.77 using 59 PHA bins.
# Reduced chi-squared = 0.8205 for 57 degrees of freedom
# Null hypothesis probability = 8.312955e-01
Photon flux (15-150 keV) in 37.61 sec: 0.806840 ( -0.077715 0.078031 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16702e-06 ( -2.19808e-07 2.21799e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.032 sec. to 13.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.64236 ( -1.09635 0.592142 )
Epeak [keV] : 9601.94 ( -9521.31 -9521.32 )
Norm@50keV : 6.20429E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.76 using 59 PHA bins.
# Reduced chi-squared = 0.8351 for 56 degrees of freedom
# Null hypothesis probability = 8.056187e-01
Photon flux (15-150 keV) in 37.61 sec: 0.805765 ( -0.081061 0.078787 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16244e-06 ( -2.4362e-07 2.24569e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.872 sec. to 3.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.26426 ( -0.350487 0.361508 )
Norm@50keV : 1.83657E-02 ( -0.00382191 0.00381775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.21 using 59 PHA bins.
# Reduced chi-squared = 0.7756 for 57 degrees of freedom
# Null hypothesis probability = 8.921341e-01
Photon flux (15-150 keV) in 1 sec: 2.17733 ( -0.47668 0.48067 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83143e-07 ( -4.0224e-08 4.04973e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.872 sec. to 3.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.748345 ( -0.943142 1.71157 )
Epeak [keV] : 133.065 ( -133.065 -133.065 )
Norm@50keV : 3.20463E-02 ( -0.0170593 0.152794 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.77 using 59 PHA bins.
# Reduced chi-squared = 0.7817 for 56 degrees of freedom
# Null hypothesis probability = 8.825132e-01
Photon flux (15-150 keV) in 1 sec: 2.13502 ( -0.48662 0.49197 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.5195e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
