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
Multiple GTIs in the spectrum
tstart tstop
47.100000 63.055400
160.000000 520.396000
XSPEC12>exit
XSPEC: quit
Photon index: -1.85062 ( -0.0703098 0.0696082 )
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85062 ( -0.0696082 0.0703098 )
Norm@50keV : 2.05602E-03 ( -8.01399e-05 7.9765e-05 )
------------------------------------------------------------
Photon flux (15-150 keV) in 376.4 sec: 0.289085 ( -0.011005 0.011034 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1169e-06 ( -2.7873e-07 2.79832e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
47.100000 63.055400
160.000000 520.396000
XSPEC: quit
Photon index: -1.34579 ( -0.299 0.321052 )
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34579 ( -0.321052 0.299 )
Epeak [keV] : 61.0776 ( -8.69946 22.6588 )
Norm@50keV : 3.75580E-03 ( -0.00110589 0.00171994 )
------------------------------------------------------------
Photon flux (15-150 keV) in 376.4 sec: 0.278936 ( -0.012363 0.012423 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.77174e-06 ( -3.38203e-07 3.40392e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 437.892 sec. to 438.892 sec.
XSPEC12>exit
XSPEC: quit
Photon index: -1.6157 ( -0.132528 0.130059 )
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61570 ( -0.130059 0.132528 )
Norm@50keV : 1.69466E-02 ( -0.00138846 0.00137628 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 2.18852 ( -0.16694 0.16701 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58216e-07 ( -1.38816e-08 1.40303e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 437.892 sec. to 438.892 sec.
XSPEC: quit
Photon index: -1.09885 ( -0.498518 0.566309 )
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09885 ( -0.566309 0.498518 )
Epeak [keV] : 82.7503 ( -22.5964 468.034 )
Norm@50keV : 3.17985E-02 ( -0.0141618 0.0307197 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 2.14430 ( -0.17252 0.17233 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51607e-07 ( -1.52775e-08 1.53982e-08 ) ergs/cm2
Time-resolved spectra
