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 0.596 sec. to 323.152 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.50969 ( -0.0657611 0.0656952 )
Norm@50keV : 2.18047E-03 ( -7.52901e-05 7.51969e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.90 using 59 PHA bins.
# Reduced chi-squared = 0.9104 for 57 degrees of freedom
# Null hypothesis probability = 6.664733e-01
Photon flux (15-150 keV) in 322.6 sec: 0.272931 ( -0.009954 0.009988 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.66337e-06 ( -2.4914e-07 2.50075e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.596 sec. to 323.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.45625 ( -0.0844678 0.246558 )
Epeak [keV] : 512.002 ( -536.195 -536.195 )
Norm@50keV : 2.31342E-03 ( -0.000359072 0.000699257 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.76 using 59 PHA bins.
# Reduced chi-squared = 0.9243 for 56 degrees of freedom
# Null hypothesis probability = 6.358710e-01
Photon flux (15-150 keV) in 322.6 sec: 0.271927 ( -0.010861 0.010305 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.63382e-06 ( -2.81614e-07 2.56899e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 117.392 sec. to 118.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.18091 ( -0.128912 0.130296 )
Norm@50keV : 2.05871E-02 ( -0.00148821 0.00148795 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.18 using 59 PHA bins.
# Reduced chi-squared = 0.8979 for 57 degrees of freedom
# Null hypothesis probability = 6.920649e-01
Photon flux (15-150 keV) in 1 sec: 2.41023 ( -0.17755 0.17779 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10029e-07 ( -1.72454e-08 1.7376e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 117.392 sec. to 118.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.17668 ( -0.179116 0.285183 )
Epeak [keV] : 9999.33 ( -9999.34 -9999.34 )
Norm@50keV : 2.06883E-02 ( -0.00149473 0.00788347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.21 using 59 PHA bins.
# Reduced chi-squared = 0.9144 for 56 degrees of freedom
# Null hypothesis probability = 6.564857e-01
Photon flux (15-150 keV) in 1 sec: 2.42476 ( -0.19256 0.16277 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09952e-07 ( -1.72705e-08 1.7364e-08 ) ergs/cm2
Time-resolved spectra
