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 -182.640 sec. to 122.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.47811 ( -0.419331 0.359337 )
Norm@50keV : 2.54963E-04 ( -7.67376e-05 7.63848e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.31 using 59 PHA bins.
# Reduced chi-squared = 0.8827 for 57 degrees of freedom
# Null hypothesis probability = 7.222544e-01
Photon flux (15-150 keV) in 305.5 sec: 4.94304E-02 ( -0.0079925 0.0080005 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.74571e-07 ( -1.67302e-07 1.79282e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -182.640 sec. to 122.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.70295 ( -0.0158011 1.65579 )
Epeak [keV] : 251.336 ( -0.657675 25.9574 )
Norm@50keV : 1.91432E-04 ( -0.000112798 0.000132288 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.12 using 59 PHA bins.
# Reduced chi-squared = 0.8950 for 56 degrees of freedom
# Null hypothesis probability = 6.959463e-01
Photon flux (15-150 keV) in 305.5 sec: 4.94774E-02 ( -0.008173 0.0077417 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.06206e-07 ( -2.85061e-07 2.52601e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -182.276 sec. to -181.276 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.59155 ( -2.33476 1.16102 )
Norm@50keV : 2.56147E-03 ( -0.00256651 0.00391279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.69 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.781747e-01
Photon flux (15-150 keV) in 1 sec: 1.11701 ( -0.583377 0.58782 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.27199e-08 ( -2.46261e-08 2.85818e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -182.276 sec. to -181.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.89348 ( )
Epeak [keV] : 1.78097 ( )
Norm@50keV : 4.22357E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.54 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 56 degrees of freedom
# Null hypothesis probability = 3.482397e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
