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 -30.448 sec. to 23.504 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.81923 ( -0.12416 0.121751 )
Norm@50keV : 4.12901E-03 ( -0.00030681 0.000303348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.48 using 59 PHA bins.
# Reduced chi-squared = 0.6399 for 57 degrees of freedom
# Null hypothesis probability = 9.843703e-01
Photon flux (15-150 keV) in 53.95 sec: 0.573296 ( -0.038591 0.038635 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04985e-06 ( -1.53746e-07 1.55219e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -30.448 sec. to 23.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.6739 ( -0.458668 0.494909 )
Epeak [keV] : 101.994 ( )
Norm@50keV : 4.95492E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.18 using 59 PHA bins.
# Reduced chi-squared = 0.6460 for 56 degrees of freedom
# Null hypothesis probability = 9.816938e-01
Photon flux (15-150 keV) in 53.95 sec: 0.569308 ( -0.040515 0.040462 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02042e-06 ( -1.7896e-07 1.75225e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.884 sec. to 5.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.54452 ( -0.229837 0.224066 )
Norm@50keV : 1.62806E-02 ( -0.00228795 0.00226987 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.06 using 59 PHA bins.
# Reduced chi-squared = 0.7554 for 57 degrees of freedom
# Null hypothesis probability = 9.141939e-01
Photon flux (15-150 keV) in 1 sec: 2.05783 ( -0.28378 0.28431 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53409e-07 ( -2.31163e-08 2.33575e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.884 sec. to 5.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.515762 ( -1.01959 1.30697 )
Epeak [keV] : 72.9586 ( -18.1849 593.238 )
Norm@50keV : 5.31923E-02 ( -0.0531939 0.175117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.12 using 59 PHA bins.
# Reduced chi-squared = 0.7164 for 56 degrees of freedom
# Null hypothesis probability = 9.460144e-01
Photon flux (15-150 keV) in 1 sec: 1.97682 ( -0.29806 0.29692 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.90471e-08 ( -2.85729e-08 2.27061e-08 ) ergs/cm2
Time-resolved spectra
