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 -0.104 sec. to 15.128 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.4965 ( -0.0515692 0.0515707 )
Norm@50keV : 1.46307E-02 ( -0.000388904 0.000388882 )
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#Fit statistic : Chi-Squared = 42.59 using 59 PHA bins.
# Reduced chi-squared = 0.7472 for 57 degrees of freedom
# Null hypothesis probability = 9.221532e-01
Photon flux (15-150 keV) in 15.23 sec: 1.82481 ( -0.05379 0.05396 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11529e-06 ( -5.95466e-08 5.96585e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.104 sec. to 15.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.40783 ( -0.11817 0.199856 )
Epeak [keV] : 364.466 ( -365.138 -365.138 )
Norm@50keV : 1.60723E-02 ( -0.00173504 0.00367108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.98 using 59 PHA bins.
# Reduced chi-squared = 0.7496 for 56 degrees of freedom
# Null hypothesis probability = 9.178127e-01
Photon flux (15-150 keV) in 15.23 sec: 1.81241 ( -0.05972 0.05975 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23891e-06 ( -1.18131e-07 1.19559e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.212 sec. to 1.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.21172 ( -0.0575026 0.0576053 )
Norm@50keV : 7.28843E-02 ( -0.00229097 0.00229072 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.35 using 59 PHA bins.
# Reduced chi-squared = 0.6378 for 57 degrees of freedom
# Null hypothesis probability = 9.849736e-01
Photon flux (15-150 keV) in 1 sec: 0.480664 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.37106e-07 ( -2.5483e-08 2.55347e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.212 sec. to 1.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.05974 ( -0.175419 0.225824 )
Epeak [keV] : 349.093 ( -349.093 -349.093 )
Norm@50keV : 8.53765E-02 ( -0.0142039 0.0218699 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.91 using 59 PHA bins.
# Reduced chi-squared = 0.6234 for 56 degrees of freedom
# Null hypothesis probability = 9.878706e-01
Photon flux (15-150 keV) in 1 sec: 8.49948 ( -0.29757 0.29792 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.30903e-07 ( -2.71342e-08 2.70286e-08 ) ergs/cm2
Time-resolved spectra
