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 -12.088 sec. to 51.400 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.70744 ( -0.315989 0.297467 )
Norm@50keV : 9.98657E-04 ( -0.000202201 0.000196035 )
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#Fit statistic : Chi-Squared = 43.49 using 59 PHA bins.
# Reduced chi-squared = 0.7629 for 57 degrees of freedom
# Null hypothesis probability = 9.063198e-01
Photon flux (15-150 keV) in 63.49 sec: 0.132985 ( -0.022 0.022001 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.86807e-07 ( -1.21783e-07 1.27155e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.088 sec. to 51.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.891897 ( -1.20921 2.17311 )
Epeak [keV] : 55.3094 ( -32.8671 -55.0185 )
Norm@50keV : 3.00355E-03 ( -0.00307167 0.0574675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.67 using 59 PHA bins.
# Reduced chi-squared = 0.7621 for 56 degrees of freedom
# Null hypothesis probability = 9.051111e-01
Photon flux (15-150 keV) in 63.49 sec: 0.128048 ( -0.023619 0.023837 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22342e-07 ( -1.40543e-07 1.68065e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 13.108 sec. to 14.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.605754 ( -0.877897 1.35167 )
Norm@50keV : 3.46508E-03 ( -0.00346468 0.00155806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.09 using 59 PHA bins.
# Reduced chi-squared = 0.8261 for 57 degrees of freedom
# Null hypothesis probability = 8.225578e-01
Photon flux (15-150 keV) in 1 sec: 0.404251 6.71025E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.41998e-08 ( -1.86304e-08 1.8819e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.108 sec. to 14.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.640419 ( -0.843302 1.46513 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.53509E-03 ( -0.00210556 0.0336171 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.10 using 59 PHA bins.
# Reduced chi-squared = 0.8411 for 56 degrees of freedom
# Null hypothesis probability = 7.955739e-01
Photon flux (15-150 keV) in 1 sec: 0.404587 ( -0.170966 0.171773 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.40829e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
