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 -0.000 sec. to 22.052 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.95436 ( -0.131518 0.127478 )
Norm@50keV : 3.38070E-03 ( -0.000281334 0.000277328 )
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#Fit statistic : Chi-Squared = 45.02 using 59 PHA bins.
# Reduced chi-squared = 0.7899 for 57 degrees of freedom
# Null hypothesis probability = 8.744701e-01
Photon flux (15-150 keV) in 22.05 sec: 0.496788 ( -0.033502 0.033519 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.86211e-07 ( -5.45729e-08 5.54207e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.000 sec. to 22.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.42773 ( -0.512311 0.590938 )
Epeak [keV] : 45.9004 ( -15.3937 73.6906 )
Norm@50keV : 6.74348E-03 ( -0.0032373 0.00785628 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.93 using 59 PHA bins.
# Reduced chi-squared = 0.7488 for 56 degrees of freedom
# Null hypothesis probability = 9.186729e-01
Photon flux (15-150 keV) in 22.05 sec: 0.484359 ( -0.0355 0.035513 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.4711e-07 ( -6.42444e-08 6.62003e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.176 sec. to 7.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.86494 ( -0.26887 0.250394 )
Norm@50keV : 8.04000E-03 ( -0.00140397 0.00135459 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.64 using 59 PHA bins.
# Reduced chi-squared = 0.8006 for 57 degrees of freedom
# Null hypothesis probability = 8.601656e-01
Photon flux (15-150 keV) in 1 sec: 1.13710 ( -0.154913 0.15491 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.39265e-08 ( -1.25489e-08 1.28895e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.176 sec. to 7.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.81801 ( -0.796882 0.988402 )
Epeak [keV] : 167.711 ( )
Norm@50keV : 8.55296E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.63 using 59 PHA bins.
# Reduced chi-squared = 0.8148 for 56 degrees of freedom
# Null hypothesis probability = 8.374653e-01
Photon flux (15-150 keV) in 1 sec: 1.12072 ( -0.249937 0.16911 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.35631e-08 ( -1.41134e-08 1.27685e-08 ) ergs/cm2
Time-resolved spectra
