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 -17.896 sec. to 4.236 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.2244 ( -0.100306 0.101665 )
Norm@50keV : 2.75889E-02 ( -0.00166649 0.0016605 )
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#Fit statistic : Chi-Squared = 76.37 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 57 degrees of freedom
# Null hypothesis probability = 4.431561e-02
Photon flux (15-150 keV) in 22.13 sec: 3.24996 ( -0.21322 0.21421 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15307e-06 ( -3.6703e-07 3.67438e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.896 sec. to 4.236 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.868278 ( -0.390702 0.459336 )
Epeak [keV] : 194.054 ( -75.8682 -194.054 )
Norm@50keV : 3.89801E-02 ( -0.0120026 0.0208127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.26 using 59 PHA bins.
# Reduced chi-squared = 1.326 for 56 degrees of freedom
# Null hypothesis probability = 5.166416e-02
Photon flux (15-150 keV) in 22.13 sec: 3.19388 ( -0.22201 0.22327 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.11226e-06 ( -3.73986e-07 3.73059e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.10804 ( -0.181505 0.182672 )
Norm@50keV : 8.24408E-02 ( -0.00970206 0.00967261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.97 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 57 degrees of freedom
# Null hypothesis probability = 1.329337e-01
Photon flux (15-150 keV) in 1 sec: 3.36155E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.59825e-07 ( -1.04089e-07 1.04248e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.379232 ( -0.935097 1.20003 )
Epeak [keV] : 100.552 ( -19.7677 63.6515 )
Norm@50keV : 0.331316 ( -0.189886 0.612183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.76 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 56 degrees of freedom
# Null hypothesis probability = 3.083305e-01
Photon flux (15-150 keV) in 1 sec: 9.13872 ( -1.18103 1.19118 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1749e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
