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 -1.976 sec. to 525.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.35159 ( -0.157066 0.158213 )
Norm@50keV : 5.18990E-04 ( -4.38091e-05 4.3665e-05 )
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#Fit statistic : Chi-Squared = 57.16 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 57 degrees of freedom
# Null hypothesis probability = 4.690213e-01
Photon flux (15-150 keV) in 527.4 sec: 6.25446E-02 ( -0.0053766 0.0053957 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6727e-06 ( -2.53397e-07 2.56103e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.976 sec. to 525.448 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.10347 ( -0.159304 0.245567 )
Epeak [keV] : 38.4852 ( -9999.36 -9999.36 )
Norm@50keV : 1.97419E-04 ( -5.21956e-05 5.12911e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.59 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 56 degrees of freedom
# Null hypothesis probability = 4.528066e-01
Photon flux (15-150 keV) in 527.4 sec: 6.31870E-02 ( -0.0060357 0.0047382 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68745e-06 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 319.264 sec. to 320.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.210968 ( -0.970375 1.43584 )
Norm@50keV : 2.25074E-03 ( -0.00224614 0.00129648 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.74 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.248049e-01
Photon flux (15-150 keV) in 1 sec: 0.283874 6.10337E-02 5.57610E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5394e-08 ( -1.20438e-08 1.19593e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 319.264 sec. to 320.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.218025 ( -0.865979 1.46946 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 2.29589E-03 ( -0.00229454 -0.00229454 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.76 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 56 degrees of freedom
# Null hypothesis probability = 1.975908e-01
Photon flux (15-150 keV) in 1 sec: 6.06188E-02 ( -0.0606188 0.163248 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5333e-08 ( -1.20108e-08 1.18418e-08 ) ergs/cm2
Time-resolved spectra
