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 -0.848 sec. to 9.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.22133 ( -0.0353454 0.0354238 )
Norm@50keV : 6.49180E-02 ( -0.00127637 0.00127546 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.82 using 59 bins.
Reduced chi-squared = 0.751228
# Null hypothesis probability of 9.18e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 10.14 sec: 7.64376 ( -0.16283 0.16314 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.63969e-06 ( -1.33933e-07 1.33882e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.848 sec. to 9.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.846669 ( -0.148738 0.153662 )
Epeak [keV] : 184.572 ( -36.357 79.0181 )
Norm@50keV : 9.34143E-02 ( -0.0122761 0.0145805 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 23.55 using 59 bins.
Reduced chi-squared = 0.420536
# Null hypothesis probability of 1.00e+00 with 56 degrees of freedom
Photon flux (15-150 keV) in 10.14 sec: 7.46306 ( -0.17505 0.17569 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23032e-06 ( 0 0 ) 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: -0.919749 ( -0.0480351 0.0482247 )
Norm@50keV : 0.214166 ( -0.00594122 0.00593499 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.60 using 59 bins.
Reduced chi-squared = 1.01053
# Null hypothesis probability of 4.53e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 24.5876 ( -0.6859 0.6861 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38556e-06 ( -7.17377e-08 7.18635e-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: -0.529416 ( -0.197334 0.206414 )
Epeak [keV] : 227.237 ( -57.6352 161.617 )
Norm@50keV : 0.313593 ( -0.0536981 0.0676413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 45.74 using 59 bins.
Reduced chi-squared = 0.816786
# Null hypothesis probability of 8.34e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 24.2277 ( -0.7067 0.707 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3557e-06 ( -7.47278e-08 7.45447e-08 ) ergs/cm2
Time-resolved spectra
