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 0.016 sec. to 10.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.02547 ( -0.775984 0.587506 )
Norm@50keV : 1.56535E-03 ( -0.000827564 0.000947945 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.94 using 59 bins.
Reduced chi-squared = 0.770877
# Null hypothesis probability of 8.98e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 10.34 sec: 0.438650 ( -0.10051 0.100955 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96852e-07 ( -5.90609e-08 6.70488e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.016 sec. to 10.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.95609 ( )
Epeak [keV] : 1.10253 ( )
Norm@50keV : 9.57122E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.38 using 59 bins.
Reduced chi-squared = 0.7925
# Null hypothesis probability of 8.69e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 10.34 sec: 0.422401 ( -0.137427 0.116648 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76718e-07 ( -5.44138e-08 6.57648e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.084 sec. to 1.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.12683 ( -0.704803 0.548316 )
Norm@50keV : 6.06878E-03 ( -0.00299047 0.00338436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 48.11 using 59 bins.
Reduced chi-squared = 0.844035
# Null hypothesis probability of 7.93e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.83344 ( -0.37416 0.37482 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.75336e-08 ( -2.05539e-08 2.26323e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.084 sec. to 1.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.9677 ( -0.0229113 0.0509479 )
Epeak [keV] : 0.635505 ( -0.418462 19.7474 )
Norm@50keV : 5.16659E-02 ( -0.0299143 0.0722902 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 49.62 using 59 bins.
Reduced chi-squared = 0.886071
# Null hypothesis probability of 7.14e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.77393 ( -0.36939 0.36749 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.82072e-08 ( -1.84873e-08 2.28973e-08 ) ergs/cm2
Time-resolved spectra
