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 -31.000 sec. to 81.000 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.39231 ( -0.0571092 0.0572663 )
Norm@50keV : 6.96323E-03 ( -0.000210158 0.000210103 )
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#Fit statistic : Chi-Squared 39.81 using 59 bins.
Reduced chi-squared = 0.698421
# Null hypothesis probability of 9.59e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 112 sec: 0.846538 ( -0.028379 0.028512 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.54863e-06 ( -2.3879e-07 2.39047e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.000 sec. to 81.000 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.38885 ( -0.139783 0.169389 )
Epeak [keV] : 9998.76 ( -9998.76 -9998.76 )
Norm@50keV : 6.98848E-03 ( -0.000210545 0.00152295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 39.82 using 59 bins.
Reduced chi-squared = 0.711071
# Null hypothesis probability of 9.50e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 112 sec: 0.847495 ( -0.033044 0.029149 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.55559e-06 ( -2.63228e-07 1.28071e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -7.500 sec. to -6.500 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.24754 ( -0.220897 0.228285 )
Norm@50keV : 1.58141E-02 ( -0.00221235 0.00221235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.37 using 59 bins.
Reduced chi-squared = 1.04158
# Null hypothesis probability of 3.89e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.86965 ( -0.26955 0.27011 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58387e-07 ( -2.39496e-08 2.4116e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.500 sec. to -6.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.578462 ( -0.771893 1.19231 )
Epeak [keV] : 104.474 ( -41.0215 -104.498 )
Norm@50keV : 3.53781E-02 ( -0.020989 0.112507 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.93 using 59 bins.
Reduced chi-squared = 1.03446
# Null hypothesis probability of 4.04e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.84533 ( -0.27216 0.27253 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50845e-07 ( -2.72872e-08 2.66352e-08 ) ergs/cm2
Time-resolved spectra
