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 17.000 sec. to 65.000 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.68686 ( -0.314407 0.296093 )
Norm@50keV : 8.56514E-04 ( -0.000174809 0.00017127 )
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#Fit statistic : Chi-Squared = 82.96 using 59 PHA bins.
# Reduced chi-squared = 1.455 for 57 degrees of freedom
# Null hypothesis probability = 1.398058e-02
Photon flux (15-150 keV) in 48 sec: 0.113241 ( -0.0208666 0.020884 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.81128e-07 ( -8.02152e-08 8.2128e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.000 sec. to 65.000 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.2864 ( -1.21252 1.64508 )
Epeak [keV] : 60.2639 ( -15.1482 68.4521 )
Norm@50keV : 4.45373E-03 ( -0.00443099 0.0235248 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.94 using 59 PHA bins.
# Reduced chi-squared = 1.410 for 56 degrees of freedom
# Null hypothesis probability = 2.338838e-02
Photon flux (15-150 keV) in 48 sec: 0.108143 ( -0.0212538 0.021387 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.56715e-07 ( -7.74984e-08 8.28686e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 40.500 sec. to 41.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.39475 ( -2.17692 1.27189 )
Norm@50keV : 1.29292E-03 ( -0.00129292 0.00131773 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.32 using 59 PHA bins.
# Reduced chi-squared = 0.6723 for 57 degrees of freedom
# Null hypothesis probability = 9.727926e-01
Photon flux (15-150 keV) in 1 sec: 0.238518 ( -0.142601 0.143539 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26e-08 ( -8.83123e-09 1.15413e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 40.500 sec. to 41.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.86816 ( )
Epeak [keV] : 7.55164 ( )
Norm@50keV : 3.02354E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.36 using 59 PHA bins.
# Reduced chi-squared = 0.6851 for 56 degrees of freedom
# Null hypothesis probability = 9.654584e-01
Photon flux (15-150 keV) in 1 sec: 0.204819 ( -0.204819 0.175445 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.94008e-09 ( 0 0 ) ergs/cm2
Time-resolved spectra
