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 -3.408 sec. to 223.068 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.09722 ( -0.0690107 0.0697919 )
Norm@50keV : 2.60687E-03 ( -9.59708e-05 9.56086e-05 )
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#Fit statistic : Chi-Squared = 54.97 using 59 PHA bins.
# Reduced chi-squared = 0.9644 for 57 degrees of freedom
# Null hypothesis probability = 5.516766e-01
Photon flux (15-150 keV) in 226.5 sec: 0.302297 ( -0.01184 0.011885 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17958e-06 ( -2.27229e-07 2.27474e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.408 sec. to 223.068 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.09371 ( -0.0677126 0.0722991 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.62150E-03 ( -4.8928e-05 0.000421013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.03 using 59 PHA bins.
# Reduced chi-squared = 0.9827 for 56 degrees of freedom
# Null hypothesis probability = 5.115706e-01
Photon flux (15-150 keV) in 226.5 sec: 0.302184 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.21539e-06 ( -2.64822e-07 1.896e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 116.780 sec. to 117.780 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.672348 ( -0.353862 0.400736 )
Norm@50keV : 5.53998E-03 ( -0.00120543 0.00113633 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.83 using 59 PHA bins.
# Reduced chi-squared = 0.9620 for 57 degrees of freedom
# Null hypothesis probability = 5.568173e-01
Photon flux (15-150 keV) in 1 sec: 0.641865 ( -0.124077 0.125298 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.84857e-08 ( -1.29528e-08 1.30091e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 116.780 sec. to 117.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.664205 ( -0.442888 1.04929 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 5.58288E-03 ( -0.00120733 -0.00558338 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.85 using 59 PHA bins.
# Reduced chi-squared = 0.9794 for 56 degrees of freedom
# Null hypothesis probability = 5.185142e-01
Photon flux (15-150 keV) in 1 sec: 0.641750 ( -0.124105 0.125188 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.87053e-08 ( -1.50861e-08 9.65029e-09 ) ergs/cm2
Time-resolved spectra
