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 -0.904 sec. to 79.064 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.1447 ( -0.305293 0.27554 )
Norm@50keV : 2.00221E-03 ( -0.000401574 0.000387371 )
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#Fit statistic : Chi-Squared = 60.62 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.468272e-01
Photon flux (15-150 keV) in 79.97 sec: 0.322161 ( -0.049545 0.0496 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49506e-06 ( -2.62101e-07 2.67802e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.904 sec. to 79.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.12917 ( -1.03877 1.77246 )
Epeak [keV] : 36.9544 ( -23.6729 25.8244 )
Norm@50keV : 7.47819E-03 ( -0.00747819 0.0730992 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 56 degrees of freedom
# Null hypothesis probability = 3.809019e-01
Photon flux (15-150 keV) in 79.97 sec: 0.310779 ( -0.051699 0.051489 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3981e-06 ( -2.75365e-07 2.90035e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.804 sec. to 2.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.81076 ( -0.540039 0.489968 )
Norm@50keV : 9.80008E-03 ( -0.00331742 0.00319736 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.12 using 59 PHA bins.
# Reduced chi-squared = 0.8442 for 57 degrees of freedom
# Null hypothesis probability = 7.926684e-01
Photon flux (15-150 keV) in 1 sec: 1.35617 ( -0.420349 0.4219 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.02028e-08 ( -2.99219e-08 3.05619e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.804 sec. to 2.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.367986 ( -1.81264 4.45052 )
Epeak [keV] : 52.9200 ( )
Norm@50keV : 5.76919E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.11 using 59 PHA bins.
# Reduced chi-squared = 0.8412 for 56 degrees of freedom
# Null hypothesis probability = 7.954598e-01
Photon flux (15-150 keV) in 1 sec: 1.30422 ( -0.438153 0.43373 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.39634e-08 ( -2.93889e-08 3.22617e-08 ) ergs/cm2
Time-resolved spectra
