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 -9.832 sec. to 103.400 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.60299 ( -0.303868 0.299385 )
Norm@50keV : 9.23266E-04 ( -0.000147323 0.0001452 )
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#Fit statistic : Chi-Squared = 56.02 using 59 PHA bins.
# Reduced chi-squared = 0.9829 for 57 degrees of freedom
# Null hypothesis probability = 5.116970e-01
Photon flux (15-150 keV) in 113.2 sec: 0.118758 ( -0.0189969 0.019083 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.77207e-07 ( -1.66028e-07 1.68271e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.832 sec. to 103.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.61643 ( -0.291698 0.604979 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 9.18281E-04 ( -0.000146042 0.000838417 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.04 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.732678e-01
Photon flux (15-150 keV) in 113.2 sec: 0.119167 ( -0.0197233 0.018984 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.85999e-07 ( -1.75026e-07 1.58977e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.972 sec. to 3.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.15835 ( -0.702017 0.787642 )
Norm@50keV : 4.92765E-03 ( -0.00171275 0.00160687 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.29 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 57 degrees of freedom
# Null hypothesis probability = 1.654217e-01
Photon flux (15-150 keV) in 1 sec: 0.575192 ( -0.203185 0.206068 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.06104e-08 ( -1.7527e-08 1.76659e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.972 sec. to 3.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.19506 ( -0.668814 0.905466 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.96708E-03 ( -0.00172634 0.0113322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.30 using 59 PHA bins.
# Reduced chi-squared = 1.202 for 56 degrees of freedom
# Null hypothesis probability = 1.432581e-01
Photon flux (15-150 keV) in 1 sec: 0.232243 ( -0.232243 0.399129 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.05266e-08 ( -1.74691e-08 1.77151e-08 ) ergs/cm2
Time-resolved spectra
