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 0.012 sec. to 121.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.06926 ( -0.545964 0.467642 )
Norm@50keV : 4.94545E-04 ( -0.000166583 0.00015511 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.22 using 59 PHA bins.
# Reduced chi-squared = 0.8460 for 57 degrees of freedom
# Null hypothesis probability = 7.896269e-01
Photon flux (15-150 keV) in 121.1 sec: 7.66513E-02 ( -0.0191461 0.0191667 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.55001e-07 ( -1.62e-07 1.68624e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 121.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.98488 ( )
Epeak [keV] : 8.24290 ( )
Norm@50keV : 5.49770E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.22 using 59 PHA bins.
# Reduced chi-squared = 0.8611 for 56 degrees of freedom
# Null hypothesis probability = 7.606882e-01
Photon flux (15-150 keV) in 121.1 sec: 7.64260E-02 ( -0.0189753 0.0189787 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52095e-07 ( -1.70841e-07 1.67162e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.048 sec. to 0.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.12956 ( -0.412389 0.442614 )
Norm@50keV : 1.28185E-02 ( -0.00332728 0.00327267 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.03 using 59 PHA bins.
# Reduced chi-squared = 0.9655 for 57 degrees of freedom
# Null hypothesis probability = 5.491572e-01
Photon flux (15-150 keV) in 1 sec: 1.49142 ( -0.4019 0.41152 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32798e-07 ( -3.34178e-08 3.34858e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.048 sec. to 0.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.21674 ( -4.43622 0.177339 )
Epeak [keV] : 68.7242 ( )
Norm@50keV : 2.70325E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.03 using 59 PHA bins.
# Reduced chi-squared = 0.9648 for 56 degrees of freedom
# Null hypothesis probability = 5.499083e-01
Photon flux (15-150 keV) in 1 sec: 1.42904 ( -0.40314 0.42205 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29181e-07 ( -3.53687e-08 3.4659e-08 ) ergs/cm2
Time-resolved spectra
