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 -0.288 sec. to 3.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.03718 ( -0.237655 0.221124 )
Norm@50keV : 6.19134E-03 ( -0.00100561 0.000980248 )
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#Fit statistic : Chi-Squared = 50.36 using 59 PHA bins.
# Reduced chi-squared = 0.8835 for 57 degrees of freedom
# Null hypothesis probability = 7.206078e-01
Photon flux (15-150 keV) in 4 sec: 0.945013 ( -0.117083 0.117097 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28944e-07 ( -3.40722e-08 3.4883e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.288 sec. to 3.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.963825 ( -1.00967 1.27918 )
Epeak [keV] : 39.5551 ( )
Norm@50keV : 2.62387E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.04 using 59 PHA bins.
# Reduced chi-squared = 0.8401 for 56 degrees of freedom
# Null hypothesis probability = 7.973538e-01
Photon flux (15-150 keV) in 4 sec: 0.915280 ( -0.119836 0.12012 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08968e-07 ( -3.48595e-08 3.84492e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.288 sec. to 0.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.6576 ( -0.28488 0.27066 )
Norm@50keV : 1.12700E-02 ( -0.00202067 0.00197989 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.71 using 59 PHA bins.
# Reduced chi-squared = 1.346 for 57 degrees of freedom
# Null hypothesis probability = 4.194527e-02
Photon flux (15-150 keV) in 1 sec: 1.47535 ( -0.24313 0.24332 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04751e-07 ( -1.96176e-08 1.99156e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.288 sec. to 0.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.623982 ( -1.14541 1.85622 )
Epeak [keV] : 64.3144 ( -17.4667 -64.2823 )
Norm@50keV : 3.89592E-02 ( -0.0390863 0.286441 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.97 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 56 degrees of freedom
# Null hypothesis probability = 4.607899e-02
Photon flux (15-150 keV) in 1 sec: 1.42676 ( -0.25774 0.25343 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85553e-08 ( -2.02953e-08 2.14057e-08 ) ergs/cm2
Time-resolved spectra
