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 -1.396 sec. to 13.440 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.52013 ( -0.3074 0.303699 )
Norm@50keV : 2.07128E-03 ( -0.000416308 0.000414253 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.02 using 59 bins.
Reduced chi-squared = 1.12316
# Null hypothesis probability of 2.44e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 14.84 sec: 0.260015 ( -0.052246 0.052444 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90686e-07 ( -6.18027e-08 6.26468e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.396 sec. to 13.440 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: 0.690416 ( -1.63425 2.51423 )
Epeak [keV] : 58.4797 ( -11.8336 35.1042 )
Norm@50keV : 2.85500E-02 ( -0.0287389 0.503946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.06 using 59 bins.
Reduced chi-squared = 1.03679
# Null hypothesis probability of 3.99e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 14.84 sec: 0.242581 ( -0.053301 0.053921 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55478e-07 ( -6.0604e-08 6.62241e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.648 sec. to 4.648 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.32697 ( -0.654947 0.509862 )
Norm@50keV : 4.16071E-03 ( -0.00183452 0.00177711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.88 using 59 bins.
Reduced chi-squared = 0.910175
# Null hypothesis probability of 6.67e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.738301 ( -0.209706 0.209764 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99742e-08 ( -1.38496e-08 1.48964e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.648 sec. to 4.648 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.586452 ( -1.57018 6.10634 )
Epeak [keV] : 29.9766 ( -24.4245 -30.2398 )
Norm@50keV : 4.97447E-02 ( -0.0591161 578.419 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.60 using 59 bins.
Reduced chi-squared = 0.903571
# Null hypothesis probability of 6.79e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.717741 ( -0.209156 0.210458 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55672e-08 ( -1.21109e-08 1.56741e-08 ) ergs/cm2
Time-resolved spectra
