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 -3.176 sec. to 29.800 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.28087 ( -0.0834755 0.0836576 )
Norm@50keV : 6.83597E-03 ( -0.000319943 0.000319931 )
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#Fit statistic : Chi-Squared 63.21 using 59 bins.
Reduced chi-squared = 1.10895
# Null hypothesis probability of 2.66e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 32.98 sec: 0.812753 ( -0.039517 0.039577 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23867e-06 ( -1.15718e-07 1.16218e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.176 sec. to 29.800 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.81682 ( -0.340649 0.369794 )
Epeak [keV] : 139.095 ( -38.8446 210.851 )
Norm@50keV : 1.12348E-02 ( -0.00335978 0.00525646 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.66 using 59 bins.
Reduced chi-squared = 1.02964
# Null hypothesis probability of 4.14e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 32.98 sec: 0.793048 ( -0.041986 0.041989 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17456e-06 ( -1.2627e-07 1.25989e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.028 sec. to 1.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.00359 ( -0.133393 0.135423 )
Norm@50keV : 2.94191E-02 ( -0.00240654 0.00240439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.11 using 59 bins.
Reduced chi-squared = 0.896667
# Null hypothesis probability of 6.95e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 3.38764 ( -0.28056 0.28078 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17753e-07 ( -2.84786e-08 2.86407e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.028 sec. to 1.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.332161 ( -0.557813 0.64837 )
Epeak [keV] : 140.561 ( -43.3511 351.896 )
Norm@50keV : 5.95055E-02 ( -0.0258889 0.0545339 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 46.78 using 59 bins.
Reduced chi-squared = 0.835357
# Null hypothesis probability of 8.05e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 3.32390 ( -0.28717 0.28648 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.09072e-07 ( -3.04471e-08 3.01859e-08 ) ergs/cm2
Time-resolved spectra
