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 18.224 sec. to 261.184 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.45493 ( -0.18404 0.183889 )
Norm@50keV : 5.67576E-04 ( -6.22797e-05 6.19563e-05 )
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#Fit statistic : Chi-Squared = 58.73 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.120149e-01
Photon flux (15-150 keV) in 243 sec: 7.00334E-02 ( -0.0075941 0.0076029 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31876e-06 ( -1.59113e-07 1.60914e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.224 sec. to 261.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.12975 ( -0.478398 0.82794 )
Epeak [keV] : 127.778 ( -62.5968 -127.806 )
Norm@50keV : 8.43450E-04 ( -0.000355738 0.00144174 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.12 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 56 degrees of freedom
# Null hypothesis probability = 3.971623e-01
Photon flux (15-150 keV) in 243 sec: 6.91640E-02 ( -0.0078485 0.0078314 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27899e-06 ( -1.84158e-07 1.81697e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 33.808 sec. to 34.808 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.86525 ( -0.505675 0.583367 )
Norm@50keV : 3.41542E-03 ( -0.00107558 0.00102948 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9574 for 57 degrees of freedom
# Null hypothesis probability = 5.667824e-01
Photon flux (15-150 keV) in 1 sec: 0.391998 ( -0.118036 0.119756 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.88624e-08 ( -1.16379e-08 1.17667e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.808 sec. to 34.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.411647 ( 0.41165 2.99235 )
Epeak [keV] : 212.229 ( -212.23 -212.23 )
Norm@50keV : 5.28378E-03 ( -0.00282161 0.0626285 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.41 using 59 PHA bins.
# Reduced chi-squared = 0.9716 for 56 degrees of freedom
# Null hypothesis probability = 5.352159e-01
Photon flux (15-150 keV) in 1 sec: 0.384124 ( -0.122694 0.123749 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8147e-08 ( -1.24099e-08 1.21405e-08 ) ergs/cm2
Time-resolved spectra
