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 1.096 sec. to 11.088 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.949486 ( -0.32801 0.36167 )
Norm@50keV : 2.55071E-03 ( -0.000495062 0.000475854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.712797e-01
Photon flux (15-150 keV) in 9.992 sec: 0.293044 ( -0.05634 0.057281 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80732e-07 ( -4.91675e-08 4.92667e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.096 sec. to 11.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.877909 ( )
Epeak [keV] : 939.050 ( )
Norm@50keV : 2.74021E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.20 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 56 degrees of freedom
# Null hypothesis probability = 4.301757e-01
Photon flux (15-150 keV) in 9.992 sec: 0.295262 ( -0.064011 0.060263 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.8162e-07 ( -5.46004e-08 5.27082e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.936 sec. to 3.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.43041 ( -0.643275 0.642156 )
Norm@50keV : 4.66928E-03 ( -0.00147952 0.0014686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.22 using 59 PHA bins.
# Reduced chi-squared = 1.8986 for 57 degrees of freedom
# Null hypothesis probability = 5.020632e-05
Photon flux (15-150 keV) in 1 sec: 0.572687 ( -0.190868 0.192252 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.48528e-08 ( -1.53658e-08 1.55198e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.936 sec. to 3.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.45531 ( -0.626591 1.29099 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.64462E-03 ( -0.00147933 0.0165235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 108.23 using 59 PHA bins.
# Reduced chi-squared = 1.9326 for 56 degrees of freedom
# Null hypothesis probability = 3.525614e-05
Photon flux (15-150 keV) in 1 sec: 0.396299 ( -0.396299 0.228356 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.46982e-08 ( -1.53366e-08 1.5776e-08 ) ergs/cm2
Time-resolved spectra
