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 4.804 sec. to 22.768 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.75011 ( -0.258453 0.246435 )
Norm@50keV : 1.68463E-03 ( -0.000275859 0.000269354 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.98 using 59 PHA bins.
# Reduced chi-squared = 0.9646 for 57 degrees of freedom
# Null hypothesis probability = 5.512148e-01
Photon flux (15-150 keV) in 17.96 sec: 0.227809 ( -0.032091 0.032102 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79221e-07 ( -4.65794e-08 4.77181e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.804 sec. to 22.768 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.03928 ( -0.560494 1.49334 )
Epeak [keV] : 58.3065 ( )
Norm@50keV : 4.25108E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.81 using 59 PHA bins.
# Reduced chi-squared = 0.9609 for 56 degrees of freedom
# Null hypothesis probability = 5.581228e-01
Photon flux (15-150 keV) in 17.96 sec: 0.221637 ( -0.033655 0.03356 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58707e-07 ( -5.38092e-08 5.70819e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.156 sec. to 7.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.4795 ( -1.48323 0.747745 )
Norm@50keV : 2.32455E-03 ( -0.00231934 0.00145932 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.21 using 59 PHA bins.
# Reduced chi-squared = 0.9862 for 57 degrees of freedom
# Null hypothesis probability = 5.046361e-01
Photon flux (15-150 keV) in 1 sec: 0.450887 ( -0.1408 0.138204 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3085e-08 ( -1.11044e-08 1.16686e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.156 sec. to 7.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.97116 ( )
Epeak [keV] : 5.03950 ( )
Norm@50keV : 3.76792E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.95 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 56 degrees of freedom
# Null hypothesis probability = 4.396753e-01
Photon flux (15-150 keV) in 1 sec: 0.286036 ( -0.141687 0.253197 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
