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 -2.728 sec. to 22.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.11949 ( -0.159437 0.152677 )
Norm@50keV : 3.15922E-03 ( -0.000330294 0.00032491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.69 using 59 PHA bins.
# Reduced chi-squared = 0.9419 for 57 degrees of freedom
# Null hypothesis probability = 6.001044e-01
Photon flux (15-150 keV) in 25.19 sec: 0.501907 ( -0.038263 0.038275 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.40984e-07 ( -6.83044e-08 6.98055e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.728 sec. to 22.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.64559 ( -0.38676 0.699769 )
Epeak [keV] : 29.7802 ( )
Norm@50keV : 6.02330E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.88 using 59 PHA bins.
# Reduced chi-squared = 0.9264 for 56 degrees of freedom
# Null hypothesis probability = 6.314736e-01
Photon flux (15-150 keV) in 25.19 sec: 0.490773 ( -0.040564 0.040631 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.99839e-07 ( -8.07566e-08 8.56289e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.104 sec. to 0.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.17038 ( -0.182714 0.173087 )
Norm@50keV : 1.42676E-02 ( -0.00184292 0.00181589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.33 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.261152e-01
Photon flux (15-150 keV) in 1 sec: 2.32610 ( -0.21651 0.21652 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33638e-07 ( -1.50365e-08 1.53736e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.104 sec. to 0.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.851116 ( -0.850288 1.02952 )
Epeak [keV] : 32.7611 ( -11.352 6.85983 )
Norm@50keV : 9.21156E-02 ( -0.0921125 0.316827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.74 using 59 PHA bins.
# Reduced chi-squared = 0.9061 for 56 degrees of freedom
# Null hypothesis probability = 6.736613e-01
Photon flux (15-150 keV) in 1 sec: 2.23764 ( -0.21938 0.22067 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
