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 -14.808 sec. to 29.736 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.38503 ( -0.320494 0.284369 )
Norm@50keV : 6.94875E-04 ( -0.000160536 0.000158827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.25 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 57 degrees of freedom
# Null hypothesis probability = 1.280882e-01
Photon flux (15-150 keV) in 44.54 sec: 0.127467 ( -0.017157 0.017167 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00961e-07 ( -5.29331e-08 5.58108e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.808 sec. to 29.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.67741 ( -0.324957 1.6152 )
Epeak [keV] : 16.2477 ( )
Norm@50keV : 1.95802E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.25 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 56 degrees of freedom
# Null hypothesis probability = 1.262717e-01
Photon flux (15-150 keV) in 44.54 sec: 0.124762 ( -0.017461 0.017582 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78292e-07 ( -5.52786e-08 6.36249e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.980 sec. to 1.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.54705 ( -0.347265 0.337849 )
Norm@50keV : 4.34529E-03 ( -0.000992843 0.000977363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.93 using 59 PHA bins.
# Reduced chi-squared = 0.9461 for 57 degrees of freedom
# Null hypothesis probability = 5.909909e-01
Photon flux (15-150 keV) in 1 sec: 0.549640 ( -0.116765 0.116829 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0927e-08 ( -9.9471e-09 1.02518e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.980 sec. to 1.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.168226 ( -1.41499 2.01974 )
Epeak [keV] : 58.3457 ( -17.1686 2336.21 )
Norm@50keV : 2.56085E-02 ( -0.0256068 0.336181 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.18 using 59 PHA bins.
# Reduced chi-squared = 0.9139 for 56 degrees of freedom
# Null hypothesis probability = 6.576753e-01
Photon flux (15-150 keV) in 1 sec: 0.527683 ( -0.117195 0.118349 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59186e-08 ( -9.98696e-09 1.1266e-08 ) ergs/cm2
Time-resolved spectra
