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 -0.844 sec. to 28.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.73242 ( -0.183772 0.179588 )
Norm@50keV : 2.59876E-03 ( -0.000261476 0.000255731 )
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#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 0.9763 for 57 degrees of freedom
# Null hypothesis probability = 5.259207e-01
Photon flux (15-150 keV) in 29.51 sec: 0.349162 ( -0.031868 0.031936 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.085e-07 ( -7.3901e-08 7.48562e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.844 sec. to 28.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.73184 ( -0.188146 0.187287 )
Epeak [keV] : 235.616 ( -9999.35 -9999.36 )
Norm@50keV : 8.55076E-04 ( -0.000470272 0.00074168 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.92 using 59 PHA bins.
# Reduced chi-squared = 0.8736 for 56 degrees of freedom
# Null hypothesis probability = 7.374035e-01
Photon flux (15-150 keV) in 29.51 sec: 0.350970 ( -0.037235 0.033646 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.51023e-07 ( -6.55783e-08 5.09534e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.232 sec. to 4.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.33732 ( -0.419969 0.430437 )
Norm@50keV : 5.52698E-03 ( -0.00131661 0.00131505 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.00 using 59 PHA bins.
# Reduced chi-squared = 0.7719 for 57 degrees of freedom
# Null hypothesis probability = 8.964000e-01
Photon flux (15-150 keV) in 1 sec: 0.664139 ( -0.163701 0.164384 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.41427e-08 ( -1.40588e-08 1.41918e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.232 sec. to 4.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.30083 ( )
Epeak [keV] : 952.084 ( )
Norm@50keV : 5.78112E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.02 using 59 PHA bins.
# Reduced chi-squared = 0.7860 for 56 degrees of freedom
# Null hypothesis probability = 8.771014e-01
Photon flux (15-150 keV) in 1 sec: 0.666704 ( -0.176406 0.170814 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.44616e-08 ( -1.56662e-08 1.27555e-08 ) ergs/cm2
Time-resolved spectra
