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 -14.420 sec. to 27.396 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.93037 ( -0.0647122 0.0641229 )
Norm@50keV : 9.62971E-03 ( -0.000339221 0.000337821 )
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#Fit statistic : Chi-Squared 60.56 using 59 bins.
Reduced chi-squared = 1.06246
# Null hypothesis probability of 3.49e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 41.82 sec: 1.40022 ( -0.05004 0.05023 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.70479e-06 ( -1.28162e-07 1.28519e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.420 sec. to 27.396 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.64218 ( -0.256366 0.273615 )
Epeak [keV] : 59.2477 ( -11.5735 78.0145 )
Norm@50keV : 1.35480E-02 ( -0.00346826 0.00508178 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.86 using 59 bins.
Reduced chi-squared = 1.01536
# Null hypothesis probability of 4.43e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 41.82 sec: 1.37067 ( -0.05601 0.0562 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.60657e-06 ( -1.5446e-07 1.53835e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.064 sec. to 2.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.66439 ( -0.171316 0.168726 )
Norm@50keV : 2.04833E-02 ( -0.0021028 0.00207983 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.45 using 59 bins.
Reduced chi-squared = 1.02544
# Null hypothesis probability of 4.22e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.68755 ( -0.26388 0.26427 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90265e-07 ( -2.05579e-08 2.07192e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.064 sec. to 2.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.66663 ( -0.169888 0.172253 )
Epeak [keV] : 9999.34 ( -9999.35 -9999.36 )
Norm@50keV : 2.04297E-02 ( -0.0110125 0.0194697 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.46 using 59 bins.
Reduced chi-squared = 1.04393
# Null hypothesis probability of 3.85e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.69099 ( -0.27459 0.26764 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90687e-07 ( -1.21945e-08 2.08274e-08 ) ergs/cm2
Time-resolved spectra
