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 0.000 sec. to 0.672 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.651269 ( -0.18078 0.192811 )
Norm@50keV : 1.73790E-02 ( -0.00202864 0.00199605 )
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#Fit statistic : Chi-Squared 74.85 using 59 bins.
Reduced chi-squared = 1.31316
# Null hypothesis probability of 5.65e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 0.672 sec: 2.01758 ( -0.22036 0.22089 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45787e-07 ( -1.63617e-08 1.64235e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.672 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.0155048 ( -0.700049 0.910639 )
Epeak [keV] : 183.400 ( -75.633 -183.45 )
Norm@50keV : 3.29616E-02 ( -0.016386 0.0458304 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 72.78 using 59 bins.
Reduced chi-squared = 1.29964
# Null hypothesis probability of 6.53e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 0.672 sec: 1.98538 ( -0.22425 0.22436 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41684e-07 ( -1.79982e-08 1.75184e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.162 sec. to 0.838 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.61338 ( -0.198976 0.214977 )
Norm@50keV : 1.21101E-02 ( -0.00156494 0.00152755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 68.25 using 59 bins.
Reduced chi-squared = 1.19737
# Null hypothesis probability of 1.46e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.41166 ( -0.16585 0.1665 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5389e-07 ( -1.79836e-08 1.80393e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.162 sec. to 0.838 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.211956 ( -0.51682 0.953025 )
Epeak [keV] : 268.465 ( -268.596 -268.596 )
Norm@50keV : 1.79563E-02 ( -0.00702596 0.025521 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.53 using 59 bins.
Reduced chi-squared = 1.20589
# Null hypothesis probability of 1.39e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.39737 ( -0.16814 0.16876 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51555e-07 ( -1.93006e-08 1.88177e-08 ) ergs/cm2
Time-resolved spectra
