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 -0.376 sec. to 49.000 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.54288 ( -0.1157 0.115603 )
Norm@50keV : 9.56213E-03 ( -0.000641406 0.000641074 )
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#Fit statistic : Chi-Squared = 54.31 using 59 PHA bins.
# Reduced chi-squared = 0.9529 for 57 degrees of freedom
# Null hypothesis probability = 5.764778e-01
Photon flux (15-150 keV) in 49.38 sec: 1.20806 ( -0.08781 0.08813 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.45032e-06 ( -3.11646e-07 3.12468e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.376 sec. to 49.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.3241 ( -0.279843 0.47844 )
Epeak [keV] : 167.660 ( )
Norm@50keV : 1.21460E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.60 using 59 PHA bins.
# Reduced chi-squared = 0.9572 for 56 degrees of freedom
# Null hypothesis probability = 5.662317e-01
Photon flux (15-150 keV) in 49.38 sec: 1.19551 ( -0.09127 0.09149 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.40921e-06 ( -3.24976e-07 3.23618e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.156 sec. to 5.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.95824 ( -0.367016 0.337845 )
Norm@50keV : 1.76300E-02 ( -0.00442197 0.00433613 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.13 using 59 PHA bins.
# Reduced chi-squared = 0.7741 for 57 degrees of freedom
# Null hypothesis probability = 8.938020e-01
Photon flux (15-150 keV) in 1 sec: 2.59527 ( -0.61723 0.6203 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62308e-07 ( -3.93491e-08 3.9603e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.156 sec. to 5.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32307 ( -2.68469 7.43562 )
Epeak [keV] : 44.8166 ( -8.20702 15.9451 )
Norm@50keV : 1.09127 ( -1.4383 14183.6 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.68 using 59 PHA bins.
# Reduced chi-squared = 0.6906 for 56 degrees of freedom
# Null hypothesis probability = 9.624678e-01
Photon flux (15-150 keV) in 1 sec: 2.39567 ( -0.68364 0.66344 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43107e-07 ( -4.06197e-08 4.4535e-08 ) ergs/cm2
Time-resolved spectra
