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 -20.508 sec. to 465.324 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.26595 ( -0.0950733 0.0960558 )
Norm@50keV : 1.10722E-03 ( -5.45422e-05 5.44275e-05 )
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#Fit statistic : Chi-Squared = 60.02 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.669099e-01
Photon flux (15-150 keV) in 485.8 sec: 0.131303 ( -0.007035 0.007059 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.36153e-06 ( -2.79264e-07 2.79876e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.508 sec. to 465.324 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.26625 ( -0.0918302 0.100809 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 1.11224E-03 ( -5.42487e-05 0.000120722 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.13 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 56 degrees of freedom
# Null hypothesis probability = 3.284859e-01
Photon flux (15-150 keV) in 485.8 sec: 0.131275 ( -0.007038 0.007057 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.39583e-06 ( -3.15551e-07 2.43241e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -7.240 sec. to -6.240 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.960276 ( -0.199578 0.209445 )
Norm@50keV : 1.72165E-02 ( -0.00194641 0.00191995 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.45 using 59 PHA bins.
# Reduced chi-squared = 0.9903 for 57 degrees of freedom
# Null hypothesis probability = 4.958423e-01
Photon flux (15-150 keV) in 1 sec: 1.97865 ( -0.2262 0.22707 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88882e-07 ( -2.14378e-08 2.14958e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.240 sec. to -6.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.951943 ( -0.203546 0.209242 )
Epeak [keV] : 9999.00 ( -9999.34 -9999.34 )
Norm@50keV : 1.73147E-02 ( -0.00191205 0.0080037 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.48 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 56 degrees of freedom
# Null hypothesis probability = 4.568299e-01
Photon flux (15-150 keV) in 1 sec: 1.97820 ( -0.22619 0.22704 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89575e-07 ( 0 0 ) ergs/cm2
Time-resolved spectra
