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 -70.916 sec. to 227.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.60396 ( -0.0440338 0.0439333 )
Norm@50keV : 7.38710E-03 ( -0.000164388 0.000164387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.25 using 59 bins.
Reduced chi-squared = 1.07456
# Null hypothesis probability of 3.26e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 298.4 sec: 0.950477 ( -0.024867 0.024981 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06081e-05 ( -4.70478e-07 4.70326e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -70.916 sec. to 227.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.60168 ( -0.0443068 0.139923 )
Epeak [keV] : 9998.06 ( -9998.47 -9998.47 )
Norm@50keV : 7.40469E-03 ( -0.000164768 0.001102 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.26 using 59 bins.
Reduced chi-squared = 1.09393
# Null hypothesis probability of 2.93e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 298.4 sec: 0.953303 ( -0.038457 0.030165 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06518e-05 ( -6.6525e-07 3.97024e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.42166 ( -0.128931 0.128547 )
Norm@50keV : 6.31156E-02 ( -0.00494287 0.00493576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.18 using 59 bins.
Reduced chi-squared = 1.0207
# Null hypothesis probability of 4.32e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 7.72510 ( -0.62524 0.62614 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.07309e-07 ( -5.11871e-08 5.13945e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.168 sec. to 1.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.10546 ( -0.379958 0.534364 )
Epeak [keV] : 150.699 ( -64.5153 -150.7 )
Norm@50keV : 8.99989E-02 ( -0.0301849 0.0710592 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.92 using 59 bins.
Reduced chi-squared = 1.01643
# Null hypothesis probability of 4.41e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 7.65274 ( -0.63516 0.63564 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.99639e-07 ( -5.35292e-08 5.31007e-08 ) ergs/cm2
Time-resolved spectra
