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 -40.336 sec. to 134.716 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.51184 ( -0.12302 0.122282 )
Norm@50keV : 1.42022E-03 ( -9.56811e-05 9.51783e-05 )
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#Fit statistic : Chi-Squared 51.47 using 59 bins.
Reduced chi-squared = 0.902982
# Null hypothesis probability of 6.82e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 175.1 sec: 0.177875 ( -0.0118 0.011821 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35492e-06 ( -1.75273e-07 1.76919e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -40.336 sec. to 134.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.51258 ( -0.120929 0.143437 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 1.42175E-03 ( -9.45419e-05 0.000562465 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.48 using 59 bins.
Reduced chi-squared = 0.919286
# Null hypothesis probability of 6.46e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 175.1 sec: 0.178598 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3829e-06 ( -2.05562e-07 1.45443e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.684 sec. to 3.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.41541 ( -0.581881 0.568426 )
Norm@50keV : 4.82449E-03 ( -0.0013358 0.00126298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.12 using 59 bins.
Reduced chi-squared = 0.879298
# Null hypothesis probability of 7.29e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.589598 ( -0.152693 0.152804 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64879e-08 ( -1.43557e-08 1.46879e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.684 sec. to 3.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.72769 ( -1.33178 4.23791 )
Epeak [keV] : 707.136 ( -66.8945 137.599 )
Norm@50keV : 1.65726E-05 ( -1.59042e-05 0.00147647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 45.09 using 59 bins.
Reduced chi-squared = 0.805179
# Null hypothesis probability of 8.52e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.159947 ( -0.110981 0.190297 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07783e-08 ( -1.93519e-08 -2.8479e-09 ) ergs/cm2
Time-resolved spectra
