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 -68.668 sec. to 81.476 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.74982 ( -0.12297 0.120571 )
Norm@50keV : 1.30715E-03 ( -9.68157e-05 9.58471e-05 )
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#Fit statistic : Chi-Squared 47.40 using 59 bins.
Reduced chi-squared = 0.831579
# Null hypothesis probability of 8.14e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 150.1 sec: 0.176745 ( -0.011931 0.011943 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81072e-06 ( -1.38468e-07 1.39985e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -68.668 sec. to 81.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.23751 ( -0.471513 0.529047 )
Epeak [keV] : 68.7060 ( -16.046 184.036 )
Norm@50keV : 2.45880E-03 ( -0.00106232 0.00221282 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.91 using 59 bins.
Reduced chi-squared = 0.784107
# Null hypothesis probability of 8.79e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 150.1 sec: 0.172377 ( -0.012565 0.012567 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72651e-06 ( -1.56181e-07 1.58573e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 69.712 sec. to 70.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.80401 ( -0.318285 0.296355 )
Norm@50keV : 5.96061E-03 ( -0.00125434 0.00121751 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.14 using 59 bins.
Reduced chi-squared = 1.07263
# Null hypothesis probability of 3.30e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.822682 ( -0.145652 0.145686 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.48744e-08 ( -1.14684e-08 1.17833e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 69.712 sec. to 70.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.934903 ( -1.13078 1.54214 )
Epeak [keV] : 53.6701 ( -20.3264 -53.6702 )
Norm@50keV : 1.83861E-02 ( -0.018386 0.121419 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.52 using 59 bins.
Reduced chi-squared = 1.06286
# Null hypothesis probability of 3.49e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.803690 ( -0.147543 0.14775 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.11152e-08 ( -1.19031e-08 1.2717e-08 ) ergs/cm2
Time-resolved spectra
