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 0.280 sec. to 6.556 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.04961 ( -0.291899 0.313143 )
Norm@50keV : 3.53167E-03 ( -0.000639679 0.000635377 )
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#Fit statistic : Chi-Squared = 54.81 using 59 PHA bins.
# Reduced chi-squared = 0.9617 for 57 degrees of freedom
# Null hypothesis probability = 5.575284e-01
Photon flux (15-150 keV) in 6.276 sec: 0.407891 ( -0.075622 0.076209 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3562e-07 ( -4.39687e-08 4.4344e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.280 sec. to 6.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.0462091 ( -1.12653 1.77992 )
Epeak [keV] : 101.946 ( -34.2453 -101.948 )
Norm@50keV : 1.08115E-02 ( -0.0108112 0.0638063 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.11 using 59 PHA bins.
# Reduced chi-squared = 0.9484 for 56 degrees of freedom
# Null hypothesis probability = 5.850411e-01
Photon flux (15-150 keV) in 6.276 sec: 0.392608 ( -0.078255 0.078818 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18309e-07 ( -5.12184e-08 5.05176e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.136 sec. to 6.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.2572 ( -0.672104 0.705774 )
Norm@50keV : 4.17168E-03 ( -0.00153365 0.00153332 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.08 using 59 PHA bins.
# Reduced chi-squared = 0.8260 for 57 degrees of freedom
# Null hypothesis probability = 8.226902e-01
Photon flux (15-150 keV) in 1 sec: 0.493984 ( -0.188272 0.190162 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.16764e-08 ( -1.65182e-08 1.68754e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.136 sec. to 6.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.732676 ( -6.48216 0.730524 )
Epeak [keV] : 133.639 ( -133.244 -133.244 )
Norm@50keV : 7.28158E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.00 using 59 PHA bins.
# Reduced chi-squared = 0.8392 for 56 degrees of freedom
# Null hypothesis probability = 7.988119e-01
Photon flux (15-150 keV) in 1 sec: 0.481938 ( -0.248521 0.198831 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.05425e-08 ( -1.74702e-08 1.77282e-08 ) ergs/cm2
Time-resolved spectra
