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 -0.796 sec. to 848.992 sec.
XSPEC12>exit
XSPEC: quit
Photon index: -1.5117 ( -0.0917008 0.0913393 )
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51170 ( -0.0913393 0.0917008 )
Norm@50keV : 8.53962E-04 ( -4.4143e-05 4.40329e-05 )
------------------------------------------------------------
Photon flux (15-150 keV) in 849.8 sec: 0.106950 ( -0.005556 0.005563 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.87221e-06 ( -3.88308e-07 3.90798e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.796 sec. to 848.992 sec.
XSPEC: quit
Photon index: -1.18648 ( -0.351304 0.382472 )
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18648 ( -0.382472 0.351304 )
Epeak [keV] : 124.898 ( -42.7204 -124.898 )
Norm@50keV : 1.24433E-03 ( -0.000401619 0.00067245 )
------------------------------------------------------------
Photon flux (15-150 keV) in 849.8 sec: 0.105032 ( -0.0059234 0.005921 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.68031e-06 ( -4.41574e-07 4.4111e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 822.692 sec. to 823.692 sec.
XSPEC12>exit
XSPEC: quit
Photon index: -1.82604 ( -0.260085 0.243149 )
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82604 ( -0.243149 0.260085 )
Norm@50keV : 9.07916E-03 ( -0.00144488 0.00138654 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 1.26401 ( -0.15936 0.15938 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.35314e-08 ( -1.31302e-08 1.34146e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 822.692 sec. to 823.692 sec.
XSPEC: quit
Photon index: -2.18577 ( -0.0533727 0.811955 )
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.18577 ( -0.811955 0.0533727 )
Epeak [keV] : 73.1238 ( )
Norm@50keV : 5.95765E-03 ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 1.26400 ( -0.15915 0.1593 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
