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 -9.528 sec. to 710.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.55196 ( -0.0932975 0.0928506 )
Norm@50keV : 8.37706E-04 ( -4.34203e-05 4.32627e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.41 using 59 PHA bins.
# Reduced chi-squared = 0.6563 for 57 degrees of freedom
# Null hypothesis probability = 9.791377e-01
Photon flux (15-150 keV) in 720 sec: 0.106112 ( -0.005457 0.005468 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67731e-06 ( -3.20914e-07 3.22986e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.528 sec. to 710.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.46213 ( -0.173835 0.352162 )
Epeak [keV] : 295.263 ( -295.283 -295.283 )
Norm@50keV : 9.30777E-04 ( -0.000132659 0.000460003 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.20 using 59 PHA bins.
# Reduced chi-squared = 0.6643 for 56 degrees of freedom
# Null hypothesis probability = 9.750915e-01
Photon flux (15-150 keV) in 720 sec: 0.105570 ( -0.0058007 0.005756 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.6298e-06 ( -3.65836e-07 3.35508e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 13.972 sec. to 14.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.89595 ( -2.03167 1.26616 )
Norm@50keV : 1.74360E-03 ( -0.00174323 0.00123826 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.27 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.649770e-01
Photon flux (15-150 keV) in 1 sec: 0.249808 ( -0.249808 0.139063 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60288e-08 ( -1.11906e-08 1.28414e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.972 sec. to 14.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.06219 ( -0.025744 2.06219 )
Epeak [keV] : 26.4827 ( )
Norm@50keV : 1.36662E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.20 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.304801e-01
Photon flux (15-150 keV) in 1 sec: 0.254978 ( -0.254978 0.133162 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
