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 -3.144 sec. to 20.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.62609 ( -0.0271072 0.0271605 )
Norm@50keV : 5.35106E-02 ( -0.000809795 0.000809292 )
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#Fit statistic : Chi-Squared = 81.48 using 59 PHA bins.
# Reduced chi-squared = 1.429 for 57 degrees of freedom
# Null hypothesis probability = 1.837607e-02
Photon flux (15-150 keV) in 24 sec: 6.93336 ( -0.13118 0.1317 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1976e-05 ( -1.77355e-07 1.76961e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.144 sec. to 20.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.2539 ( -0.114996 0.117752 )
Epeak [keV] : 119.804 ( -14.9703 26.5974 )
Norm@50keV : 7.68032E-02 ( -0.00792599 0.00903762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.57 using 59 PHA bins.
# Reduced chi-squared = 0.8853 for 56 degrees of freedom
# Null hypothesis probability = 7.151320e-01
Photon flux (15-150 keV) in 24 sec: 6.69518 ( -0.14597 0.14702 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.7773e-06 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.856 sec. to 2.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.38766 ( -0.030819 0.0308685 )
Norm@50keV : 0.443734 ( -0.00785242 0.00784781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.24 using 59 PHA bins.
# Reduced chi-squared = 1.425 for 57 degrees of freedom
# Null hypothesis probability = 1.918626e-02
Photon flux (15-150 keV) in 1 sec: 1.26213 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29912e-06 ( -7.58388e-08 7.58996e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.856 sec. to 2.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.984887 ( -0.129127 0.132731 )
Epeak [keV] : 151.992 ( -23.0216 42.2547 )
Norm@50keV : 0.656164 ( -0.0755282 0.0875334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.46 using 59 PHA bins.
# Reduced chi-squared = 0.9189 for 56 degrees of freedom
# Null hypothesis probability = 6.473052e-01
Photon flux (15-150 keV) in 1 sec: 52.4184 ( -1.1578 1.1632 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24307e-06 ( -7.85016e-08 7.8385e-08 ) ergs/cm2
Time-resolved spectra
