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 -0.284 sec. to 4.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.27155 ( -0.18958 0.17886 )
Norm@50keV : 4.74712E-03 ( -0.000611198 0.000600598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.56 using 59 PHA bins.
# Reduced chi-squared = 0.7291 for 57 degrees of freedom
# Null hypothesis probability = 9.380525e-01
Photon flux (15-150 keV) in 4.396 sec: 0.816764 ( -0.071889 0.071908 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98453e-07 ( -2.09451e-08 2.14533e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.284 sec. to 4.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.79845 ( -0.201724 0.912424 )
Epeak [keV] : 16.3072 ( )
Norm@50keV : 9.20053E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.35 using 59 PHA bins.
# Reduced chi-squared = 0.7206 for 56 degrees of freedom
# Null hypothesis probability = 9.429018e-01
Photon flux (15-150 keV) in 4.396 sec: 0.815617 ( -0.071539 0.073982 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.14877 ( -0.229351 0.213611 )
Norm@50keV : 8.29201E-03 ( -0.00130349 0.00127251 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.40 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.602142e-01
Photon flux (15-150 keV) in 1 sec: 1.33697 ( -0.15122 0.15124 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.74622e-08 ( -1.06047e-08 1.08702e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.108 sec. to 0.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.47744 ( -0.673088 1.01696 )
Epeak [keV] : 31.4446 ( )
Norm@50keV : 2.06554E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.53 using 59 PHA bins.
# Reduced chi-squared = 0.9917 for 56 degrees of freedom
# Null hypothesis probability = 4.924833e-01
Photon flux (15-150 keV) in 1 sec: 1.30788 ( -0.15491 0.15513 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
