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 6.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.53099 ( -0.285377 0.256229 )
Norm@50keV : 8.23885E-03 ( -0.0017745 0.00176813 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.84 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.074100e-01
Photon flux (15-150 keV) in 7.424 sec: 1.64994 ( -0.22281 0.22282 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17004e-07 ( -9.92804e-08 1.02474e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.848 sec. to 6.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23391 ( -2.16884 4.83757 )
Epeak [keV] : 27.3685 ( -5.44053 3.67122 )
Norm@50keV : 14.2225 ( -13.5206 6763.34 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.89 using 59 PHA bins.
# Reduced chi-squared = 0.9088 for 56 degrees of freedom
# Null hypothesis probability = 6.680832e-01
Photon flux (15-150 keV) in 7.424 sec: 1.55022 ( -0.222 0.2238 ) 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 0.412 sec. to 1.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.264 ( -0.413049 0.313263 )
Norm@50keV : 7.41514E-03 ( -0.00253738 0.00240295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.63 using 59 PHA bins.
# Reduced chi-squared = 0.9584 for 57 degrees of freedom
# Null hypothesis probability = 5.646130e-01
Photon flux (15-150 keV) in 1 sec: 2.48755 ( -0.56774 0.56774 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01793e-07 ( -2.37148e-08 2.36655e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.412 sec. to 1.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1 ( )
Epeak [keV] : 80.0000 ( )
Norm@50keV : 7.15072E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.68 using 59 PHA bins.
# Reduced chi-squared = 1.709 for 56 degrees of freedom
# Null hypothesis probability = 7.570057e-04
Photon flux (15-150 keV) in 1 sec: 2.78884 ( -0.59566 0.59598 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
