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 -50.176 sec. to 108.844 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.70464 ( -0.113954 0.111943 )
Norm@50keV : 1.24133E-03 ( -8.4912e-05 8.4195e-05 )
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#Fit statistic : Chi-Squared = 45.94 using 59 PHA bins.
# Reduced chi-squared = 0.8060 for 57 degrees of freedom
# Null hypothesis probability = 8.526045e-01
Photon flux (15-150 keV) in 159 sec: 0.165137 ( -0.010358 0.010367 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82704e-06 ( -1.31032e-07 1.32471e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -50.176 sec. to 108.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.00896 ( -0.471319 0.529966 )
Epeak [keV] : 66.1118 ( -12.1652 42.3137 )
Norm@50keV : 2.90652E-03 ( -0.00125047 0.00259822 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.26 using 59 PHA bins.
# Reduced chi-squared = 0.7012 for 56 degrees of freedom
# Null hypothesis probability = 9.562720e-01
Photon flux (15-150 keV) in 159 sec: 0.159348 ( -0.011027 0.011028 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71127e-06 ( -1.48276e-07 1.51363e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 94.916 sec. to 95.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.27366 ( -0.245272 0.247734 )
Norm@50keV : 7.23397E-03 ( -0.000985303 0.000982545 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.51 using 59 PHA bins.
# Reduced chi-squared = 0.9212 for 57 degrees of freedom
# Null hypothesis probability = 6.440698e-01
Photon flux (15-150 keV) in 1 sec: 0.858992 ( -0.117593 0.117833 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.19631e-08 ( -1.11804e-08 1.1334e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 94.916 sec. to 95.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.2762 ( -0.241973 0.681959 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 7.24720E-03 ( -0.00726253 0.00788044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.52 using 59 PHA bins.
# Reduced chi-squared = 0.9378 for 56 degrees of freedom
# Null hypothesis probability = 6.074694e-01
Photon flux (15-150 keV) in 1 sec: 0.862597 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.7105e-08 ( -1.20926e-08 1.03043e-08 ) ergs/cm2
Time-resolved spectra
