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 -24.332 sec. to 157.740 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.22674 ( -0.0699957 0.0704736 )
Norm@50keV : 2.56540E-03 ( -9.32103e-05 9.31616e-05 )
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#Fit statistic : Chi-Squared = 61.22 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 57 degrees of freedom
# Null hypothesis probability = 3.270881e-01
Photon flux (15-150 keV) in 182.1 sec: 0.302310 ( -0.01168 0.01173 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.70501e-06 ( -1.85826e-07 1.86467e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.332 sec. to 157.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.22699 ( -0.06651 0.127725 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.57746E-03 ( -9.32387e-05 0.00019752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.34 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 56 degrees of freedom
# Null hypothesis probability = 2.905632e-01
Photon flux (15-150 keV) in 182.1 sec: 0.302231 ( -0.011693 0.011719 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.72868e-06 ( -2.11371e-07 1.60768e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.152 sec. to 1.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.643958 ( -0.242263 0.267078 )
Norm@50keV : 1.04790E-02 ( -0.00155162 0.00148994 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.30 using 59 PHA bins.
# Reduced chi-squared = 1.532 for 57 degrees of freedom
# Null hypothesis probability = 6.040391e-03
Photon flux (15-150 keV) in 1 sec: 1.21745 ( -0.16185 0.16247 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31256e-07 ( -1.72914e-08 1.73444e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.152 sec. to 1.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.640653 ( -0.239797 0.344013 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 1.05776E-02 ( -0.00142554 0.00543635 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.34 using 59 PHA bins.
# Reduced chi-squared = 1.560 for 56 degrees of freedom
# Null hypothesis probability = 4.653480e-03
Photon flux (15-150 keV) in 1 sec: 1.21715 ( -0.16182 0.16243 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22098e-09 ( 0 0 ) ergs/cm2
Time-resolved spectra
