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 -17.656 sec. to 109.308 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.40922 ( -0.195135 0.19711 )
Norm@50keV : 1.54992E-03 ( -0.000174666 0.000174445 )
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#Fit statistic : Chi-Squared 53.78 using 59 bins.
Reduced chi-squared = 0.943509
# Null hypothesis probability of 5.97e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 127 sec: 0.189153 ( -0.022342 0.022433 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89869e-06 ( -2.30389e-07 2.31577e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.656 sec. to 109.308 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.40627 ( -0.363678 0.698002 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.55546E-03 ( -0.000175307 0.000174552 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 53.78 using 59 bins.
Reduced chi-squared = 0.960357
# Null hypothesis probability of 5.59e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 127 sec: 0.189223 ( -0.022641 0.022278 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90039e-06 ( -2.4811e-07 2.07674e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -17.664 sec. to -16.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.761752 ( -0.337054 0.379351 )
Norm@50keV : 1.03131E-02 ( -0.00249088 0.0024009 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 52.72 using 59 bins.
Reduced chi-squared = 0.924912
# Null hypothesis probability of 6.36e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.18727 ( -0.267346 0.27213 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22512e-07 ( -2.52216e-08 2.52218e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.664 sec. to -16.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.472855 ( -1.36682 2.43314 )
Epeak [keV] : 129.388 ( -46.8302 -129.507 )
Norm@50keV : 3.11895E-02 ( -0.0311285 0.184972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.95 using 59 bins.
Reduced chi-squared = 0.909821
# Null hypothesis probability of 6.66e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.14629 ( -0.266159 0.27484 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20687e-07 ( -2.65522e-08 2.59691e-08 ) ergs/cm2
Time-resolved spectra
