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 -17.800 sec. to 85.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.73961 ( -0.233726 0.225637 )
Norm@50keV : 2.20125E-03 ( -0.000315447 0.000308157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.25 using 59 PHA bins.
# Reduced chi-squared = 1.285 for 57 degrees of freedom
# Null hypothesis probability = 7.232391e-02
Photon flux (15-150 keV) in 103.5 sec: 0.296528 ( -0.037616 0.037647 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10388e-06 ( -3.09388e-07 3.1437e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.800 sec. to 85.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.71607 ( -0.988891 0.789902 )
Epeak [keV] : 514.469 ( )
Norm@50keV : 2.26811E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.27 using 59 PHA bins.
# Reduced chi-squared = 1.308 for 56 degrees of freedom
# Null hypothesis probability = 6.051213e-02
Photon flux (15-150 keV) in 103.5 sec: 0.296877 ( -0.038425 0.037713 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10868e-06 ( -2.87928e-07 3.12966e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 31.580 sec. to 32.580 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.04481 ( -0.612332 0.540118 )
Norm@50keV : 6.04676E-03 ( -0.00241473 0.0023145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.85 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 57 degrees of freedom
# Null hypothesis probability = 2.484648e-01
Photon flux (15-150 keV) in 1 sec: 0.926289 ( -0.363339 0.363581 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59294e-08 ( -2.10716e-08 2.10545e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.580 sec. to 32.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.63483 ( -1.2818 2.51734 )
Epeak [keV] : 45.3985 ( )
Norm@50keV : 9.98984E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.74 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 56 degrees of freedom
# Null hypothesis probability = 2.228678e-01
Photon flux (15-150 keV) in 1 sec: 0.932416 ( -0.364906 0.365284 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
