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 119.784 sec. to 415.956 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.56343 ( -0.252157 0.247072 )
Norm@50keV : 3.73886E-04 ( -5.48472e-05 5.37305e-05 )
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#Fit statistic : Chi-Squared = 70.07 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 57 degrees of freedom
# Null hypothesis probability = 1.144676e-01
Photon flux (15-150 keV) in 296.2 sec: 4.75192E-02 ( -0.0064084 0.0064143 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04075e-06 ( -1.65752e-07 1.68947e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 119.784 sec. to 415.956 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.56926 ( -0.246796 0.301753 )
Epeak [keV] : 9999.18 ( -9999.33 -9999.33 )
Norm@50keV : 3.74091E-04 ( -5.46663e-05 0.000367887 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.08 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 56 degrees of freedom
# Null hypothesis probability = 9.766331e-02
Photon flux (15-150 keV) in 296.2 sec: 4.77820E-02 ( -0.0068264 0.0074851 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06041e-06 ( -1.8711e-07 1.46302e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 301.656 sec. to 302.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.17301 ( -0.584956 0.625521 )
Norm@50keV : 2.46505E-03 ( -0.000898458 0.000898353 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.61 using 59 PHA bins.
# Reduced chi-squared = 0.9581 for 57 degrees of freedom
# Null hypothesis probability = 5.651262e-01
Photon flux (15-150 keV) in 1 sec: 0.288335 ( -0.10678 0.107698 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51988e-08 ( -9.86464e-09 1.01912e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 301.656 sec. to 302.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.62954 ( -3.79305 -2.70725 )
Epeak [keV] : 61.2025 ( -14.9729 289.333 )
Norm@50keV : 0.169928 ( -0.20962 566.695 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.64 using 59 PHA bins.
# Reduced chi-squared = 0.9222 for 56 degrees of freedom
# Null hypothesis probability = 6.403367e-01
Photon flux (15-150 keV) in 1 sec: 0.243605 ( -0.105408 0.116004 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93135e-08 ( -8.08427e-09 1.09877e-08 ) ergs/cm2
Time-resolved spectra
