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 -0.384 sec. to 9.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.30918 ( -0.260411 0.271062 )
Norm@50keV : 5.03804E-03 ( -0.000768186 0.000765856 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.18 using 59 PHA bins.
# Reduced chi-squared = 1.284 for 57 degrees of freedom
# Null hypothesis probability = 7.310356e-02
Photon flux (15-150 keV) in 9.556 sec: 0.602088 ( -0.09957 0.10073 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7474e-07 ( -7.408e-08 7.43531e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.384 sec. to 9.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.81186 ( -0.714985 1.50025 )
Epeak [keV] : 128.377 ( -67.0625 -129.846 )
Norm@50keV : 8.66921E-03 ( -0.00420097 0.0331035 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.69 using 59 PHA bins.
# Reduced chi-squared = 1.298 for 56 degrees of freedom
# Null hypothesis probability = 6.624025e-02
Photon flux (15-150 keV) in 9.556 sec: 0.588762 ( -0.104923 0.105509 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.61356e-07 ( -8.44039e-08 8.10021e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.196 sec. to 7.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.10899 ( -0.564664 0.662074 )
Norm@50keV : 7.93068E-03 ( -0.0026454 0.00242046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.424933e-01
Photon flux (15-150 keV) in 1 sec: 0.920711 ( -0.307379 0.316359 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.26894e-08 ( -2.39202e-08 2.39457e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.196 sec. to 7.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.1265 ( -0.547725 0.977587 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 8.01019E-03 ( -0.00233916 0.0186753 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.90 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 56 degrees of freedom
# Null hypothesis probability = 4.051678e-01
Photon flux (15-150 keV) in 1 sec: 0.950181 ( -0.33713 0.286899 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.26533e-08 ( -2.39098e-08 2.35089e-08 ) ergs/cm2
Time-resolved spectra
