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 10.152 sec. to 58.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.84532 ( -0.256309 0.24275 )
Norm@50keV : 1.37536E-03 ( -0.000234634 0.000228556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.55 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.545541e-01
Photon flux (15-150 keV) in 48.58 sec: 0.192966 ( -0.026128 0.026128 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.14493e-07 ( -1.02968e-07 1.06328e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.152 sec. to 58.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.18523 ( -0.990018 1.64526 )
Epeak [keV] : 48.4551 ( )
Norm@50keV : 3.44342E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.68 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.494813e-01
Photon flux (15-150 keV) in 48.58 sec: 0.188132 ( -0.027569 0.027562 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60322e-07 ( -1.25864e-07 1.40468e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 11.052 sec. to 12.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.27152 ( -0.53259 0.562685 )
Norm@50keV : 5.02853E-03 ( -0.00146726 0.00146044 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.78 using 59 PHA bins.
# Reduced chi-squared = 0.7329 for 57 degrees of freedom
# Null hypothesis probability = 9.348790e-01
Photon flux (15-150 keV) in 1 sec: 0.596888 ( -0.176167 0.176825 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.00507e-08 ( -1.62963e-08 1.67898e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.052 sec. to 12.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.26982 ( -0.533735 0.567986 )
Epeak [keV] : 9999.31 ( -9999.36 -9999.36 )
Norm@50keV : 5.04942E-03 ( -0.00147807 0.0450326 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.78 using 59 PHA bins.
# Reduced chi-squared = 0.7460 for 56 degrees of freedom
# Null hypothesis probability = 9.212593e-01
Photon flux (15-150 keV) in 1 sec: 0.599622 ( -0.184528 0.178677 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08382e-08 ( -2.16666e-08 1.91976e-08 ) ergs/cm2
Time-resolved spectra
