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 0.000 sec. to 0.028 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.27542 ( -0.399023 0.405249 )
Norm@50keV : 2.55981E-02 ( -0.00658928 0.00656488 )
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#Fit statistic : Chi-Squared = 55.54 using 59 PHA bins.
# Reduced chi-squared = 0.9743 for 57 degrees of freedom
# Null hypothesis probability = 5.300914e-01
Photon flux (15-150 keV) in 0.028 sec: 3.04061 ( -0.7795 0.78076 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.12636e-09 ( -2.01699e-09 2.06898e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.028 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: 2.4746 ( -2.76842 6.69051 )
Epeak [keV] : 58.0686 ( -9.9492 40.5865 )
Norm@50keV : 1.97798 ( -2.07402 1544.08 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.43 using 59 PHA bins.
# Reduced chi-squared = 0.9005 for 56 degrees of freedom
# Null hypothesis probability = 6.848796e-01
Photon flux (15-150 keV) in 0.028 sec: 2.76626 ( -0.78964 0.80797 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84881e-09 ( -1.62312e-09 2.01292e-09 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.484 sec. to 0.516 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.960004 ( -1.00524 1.47726 )
Norm@50keV : 1.65738E-03 ( -0.00165737 0.000845336 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.12 using 59 PHA bins.
# Reduced chi-squared = 0.6863 for 57 degrees of freedom
# Null hypothesis probability = 9.661161e-01
Photon flux (15-150 keV) in 1 sec: 0.190476 ( -0.190476 0.101144 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81849e-08 ( -9.61709e-09 9.80491e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.484 sec. to 0.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.12871 ( 9.99768 13.0578 )
Epeak [keV] : 575.715 ( )
Norm@50keV : 1.60219E-05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.90 using 59 PHA bins.
# Reduced chi-squared = 0.6768 for 56 degrees of freedom
# Null hypothesis probability = 9.696009e-01
Photon flux (15-150 keV) in 1 sec: 0.193499 ( -0.193499 0.112667 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81823e-08 ( -7.02883e-09 6.48434e-09 ) ergs/cm2
Time-resolved spectra
