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 -6.816 sec. to 15.840 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.83264 ( -0.159634 0.154318 )
Norm@50keV : 2.31804E-03 ( -0.000241785 0.000238221 )
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#Fit statistic : Chi-Squared = 54.75 using 59 PHA bins.
# Reduced chi-squared = 0.9606 for 57 degrees of freedom
# Null hypothesis probability = 5.598560e-01
Photon flux (15-150 keV) in 22.66 sec: 0.323571 ( -0.028785 0.028794 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83193e-07 ( -5.03503e-08 5.11869e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.816 sec. to 15.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.936578 ( -0.688293 0.825125 )
Epeak [keV] : 50.4613 ( -9.61362 31.3111 )
Norm@50keV : 7.51677E-03 ( -0.00441913 0.0148388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.60 using 59 PHA bins.
# Reduced chi-squared = 0.8856 for 56 degrees of freedom
# Null hypothesis probability = 7.143657e-01
Photon flux (15-150 keV) in 22.66 sec: 0.313306 ( -0.029738 0.029777 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.4209e-07 ( -5.59364e-08 5.88204e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.656 sec. to 2.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.48468 ( -0.316317 0.310829 )
Norm@50keV : 5.60849E-03 ( -0.0011051 0.00109457 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.36 using 59 PHA bins.
# Reduced chi-squared = 0.9537 for 57 degrees of freedom
# Null hypothesis probability = 5.746558e-01
Photon flux (15-150 keV) in 1 sec: 0.697336 ( -0.133939 0.134172 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.3347e-08 ( -1.13479e-08 1.15523e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.656 sec. to 2.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.228703 ( -1.36428 2.0766 )
Epeak [keV] : 67.9212 ( -16.2523 -67.9211 )
Norm@50keV : 2.51795E-02 ( -0.0251796 0.26041 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.11 using 59 PHA bins.
# Reduced chi-squared = 0.9305 for 56 degrees of freedom
# Null hypothesis probability = 6.229793e-01
Photon flux (15-150 keV) in 1 sec: 0.667220 ( -0.139545 0.139234 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.8671e-08 ( -1.21897e-08 1.27264e-08 ) ergs/cm2
Time-resolved spectra
