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 -38.000 sec. to 133.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.67222 ( -0.145105 0.142771 )
Norm@50keV : 2.18976E-03 ( -0.000179086 0.000177611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.09 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.699496e-01
Photon flux (15-150 keV) in 171.3 sec: 0.288070 ( -0.023134 0.023207 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48174e-06 ( -2.99468e-07 3.01877e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -38.000 sec. to 133.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.67063 ( -0.824444 0.452176 )
Epeak [keV] : 1.00000E+04 ( -9999.99 -10000 )
Norm@50keV : 2.19408E-03 ( -0.000180094 0.000169277 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.09 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 56 degrees of freedom
# Null hypothesis probability = 2.400858e-01
Photon flux (15-150 keV) in 171.3 sec: 0.289135 ( -0.027936 0.025249 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50031e-06 ( -3.78063e-07 2.55532e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.704 sec. to 9.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.61587 ( -0.432474 0.417824 )
Norm@50keV : 1.03006E-02 ( -0.00263978 0.00260633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.58 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.536137e-01
Photon flux (15-150 keV) in 1 sec: 1.33032 ( -0.341383 0.34336 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.61657e-08 ( -2.56558e-08 2.59946e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.704 sec. to 9.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.997679 ( -1.28461 2.2229 )
Epeak [keV] : 82.7794 ( -72.6644 -82.7793 )
Norm@50keV : 2.10043E-02 ( -0.01312 0.218166 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.17 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.315087e-01
Photon flux (15-150 keV) in 1 sec: 1.30030 ( -0.351026 0.35254 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.32975e-08 ( -2.67349e-08 2.71007e-08 ) ergs/cm2
Time-resolved spectra
