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 -0.068 sec. to 9.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.47374 ( -0.246634 0.227504 )
Norm@50keV : 4.95785E-03 ( -0.000836987 0.000822281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.54 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 57 degrees of freedom
# Null hypothesis probability = 4.185311e-01
Photon flux (15-150 keV) in 9.956 sec: 0.958639 ( -0.105124 0.105201 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.90303e-07 ( -6.17498e-08 6.32062e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.068 sec. to 9.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.81447 ( -0.187983 1.30195 )
Epeak [keV] : 10.4592 ( )
Norm@50keV : 1.26316E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 56 degrees of freedom
# Null hypothesis probability = 4.275784e-01
Photon flux (15-150 keV) in 9.956 sec: 0.934548 ( -0.111141 0.107842 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.928 sec. to 5.928 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.43605 ( -0.461428 0.401835 )
Norm@50keV : 7.50593E-03 ( -0.00244453 0.00243357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.26 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 57 degrees of freedom
# Null hypothesis probability = 3.930457e-01
Photon flux (15-150 keV) in 1 sec: 1.41884 ( -0.31798 0.31819 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.38499e-08 ( -1.8854e-08 1.97187e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.928 sec. to 5.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.0171221 ( -2.06789 -0.0528611 )
Epeak [keV] : 26.8898 ( )
Norm@50keV : 0.317531 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 0.9974 for 56 degrees of freedom
# Null hypothesis probability = 4.803649e-01
Photon flux (15-150 keV) in 1 sec: 1.33308 ( -0.32638 0.32901 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
