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 -20.884 sec. to 22.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.63299 ( -0.0476358 0.0476073 )
Norm@50keV : 2.09075E-02 ( -0.000529787 0.000529753 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 79.99 using 59 bins.
Reduced chi-squared = 1.40333
# Null hypothesis probability of 2.40e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 43.8 sec: 2.71500 ( -0.07862 0.07891 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.53303e-06 ( -2.22395e-07 2.22737e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.884 sec. to 22.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.38947 ( -0.187071 0.19547 )
Epeak [keV] : 135.829 ( -37.3972 238.167 )
Norm@50keV : 2.71193E-02 ( -0.00479441 0.00612133 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 74.99 using 59 bins.
Reduced chi-squared = 1.33911
# Null hypothesis probability of 4.59e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 43.8 sec: 2.66422 ( -0.08673 0.08715 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.39585e-06 ( -2.46663e-07 2.45752e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -13.508 sec. to -12.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.01451 ( -0.0851776 0.0860821 )
Norm@50keV : 9.65000E-02 ( -0.00496326 0.004957 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.17 using 59 bins.
Reduced chi-squared = 1.02053
# Null hypothesis probability of 4.32e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.456917 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03829e-06 ( -5.72652e-08 5.74058e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -13.508 sec. to -12.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.628913 ( -0.343528 0.373398 )
Epeak [keV] : 205.840 ( -73.6344 793.272 )
Norm@50keV : 0.143608 ( -0.041917 0.0647199 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.48 using 59 bins.
Reduced chi-squared = 0.972857
# Null hypothesis probability of 5.33e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 10.9978 ( -0.5928 0.593 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02542e-06 ( -5.96583e-08 5.93309e-08 ) ergs/cm2
Time-resolved spectra
