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 -5.320 sec. to 40.340 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.57969 ( -0.0704107 0.0701956 )
Norm@50keV : 7.86962E-03 ( -0.000309696 0.000309378 )
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#Fit statistic : Chi-Squared 53.71 using 59 bins.
Reduced chi-squared = 0.942281
# Null hypothesis probability of 5.99e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 45.66 sec: 1.00506 ( -0.041645 0.04174 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3695e-06 ( -1.40667e-07 1.41134e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.320 sec. to 40.340 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.18279 ( -0.281534 0.301273 )
Epeak [keV] : 106.394 ( -25.4217 123.17 )
Norm@50keV : 1.22841E-02 ( -0.00325353 0.00480189 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.77 using 59 bins.
Reduced chi-squared = 0.853036
# Null hypothesis probability of 7.75e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 45.66 sec: 0.981459 ( -0.044619 0.044701 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26535e-06 ( -1.51786e-07 1.60173e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.068 sec. to 1.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.55624 ( -0.172355 0.169486 )
Norm@50keV : 2.14502E-02 ( -0.00231602 0.00229796 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.85 using 59 bins.
Reduced chi-squared = 1.17281
# Null hypothesis probability of 1.75e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.72048 ( -0.2835 0.28371 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01786e-07 ( -2.34496e-08 2.36431e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.068 sec. to 1.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.00867 ( -0.619359 0.788987 )
Epeak [keV] : 88.0603 ( -27.7553 -88.0605 )
Norm@50keV : 4.14900E-02 ( -0.0212228 0.0639227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.91 using 59 bins.
Reduced chi-squared = 1.15911
# Null hypothesis probability of 1.94e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.67765 ( -0.28981 0.28905 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94639e-07 ( -2.52676e-08 2.53141e-08 ) ergs/cm2
Time-resolved spectra
