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 0.112 sec. to 4.616 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.33658 ( -0.230079 0.212835 )
Norm@50keV : 3.84233E-03 ( -0.000633324 0.000622819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.66 using 59 PHA bins.
# Reduced chi-squared = 1.415 for 57 degrees of freedom
# Null hypothesis probability = 2.129149e-02
Photon flux (15-150 keV) in 4.504 sec: 0.685497 ( -0.0747 0.074701 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66578e-07 ( -2.20148e-08 2.26032e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.112 sec. to 4.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.58815 ( -0.620638 1.11245 )
Epeak [keV] : 20.4237 ( )
Norm@50keV : 1.12293E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.34 using 59 PHA bins.
# Reduced chi-squared = 1.399 for 56 degrees of freedom
# Null hypothesis probability = 2.604261e-02
Photon flux (15-150 keV) in 4.504 sec: 0.671824 ( -0.075772 0.075966 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.110 sec. to 1.110 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.90854 ( -0.215356 0.205122 )
Norm@50keV : 8.96834E-03 ( -0.00131389 0.00128897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.27 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 57 degrees of freedom
# Null hypothesis probability = 3.928100e-01
Photon flux (15-150 keV) in 1 sec: 1.29182 ( -0.15956 0.15962 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.24746e-08 ( -1.17338e-08 1.19358e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.110 sec. to 1.110 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.788688 ( -0.918745 1.21986 )
Epeak [keV] : 44.9248 ( -5.33637 25.9735 )
Norm@50keV : 4.01873E-02 ( -0.0401847 0.176447 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.73 using 59 PHA bins.
# Reduced chi-squared = 0.9773 for 56 degrees of freedom
# Null hypothesis probability = 5.231675e-01
Photon flux (15-150 keV) in 1 sec: 1.25572 ( -0.16162 0.16196 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.49083e-08 ( -1.24256e-08 1.32006e-08 ) ergs/cm2
Time-resolved spectra
