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 -11.008 sec. to 13.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.14419 ( -0.262174 0.240176 )
Norm@50keV : 1.08842E-03 ( -0.000202509 0.00019819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.81 using 59 PHA bins.
# Reduced chi-squared = 0.8037 for 57 degrees of freedom
# Null hypothesis probability = 8.558285e-01
Photon flux (15-150 keV) in 24.58 sec: 0.175084 ( -0.022365 0.022369 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49789e-07 ( -4.02903e-08 4.18003e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.008 sec. to 13.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.10799 ( -1.04826 1.40462 )
Epeak [keV] : 32.6837 ( )
Norm@50keV : 4.70369E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.95 using 59 PHA bins.
# Reduced chi-squared = 0.7669 for 56 degrees of freedom
# Null hypothesis probability = 8.998061e-01
Photon flux (15-150 keV) in 24.58 sec: 0.170107 ( -0.022564 0.022728 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25109e-07 ( -4.08057e-08 4.67681e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.172 sec. to 1.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.28526 ( -0.522424 0.429843 )
Norm@50keV : 2.82075E-03 ( -0.0010337 0.00101088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.90 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 57 degrees of freedom
# Null hypothesis probability = 3.708619e-01
Photon flux (15-150 keV) in 1 sec: 0.488993 ( -0.109673 0.109843 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.68893e-08 ( -7.81713e-09 8.44366e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.172 sec. to 1.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.47286 ( -0.617039 3.45379 )
Epeak [keV] : 22.9340 ( )
Norm@50keV : 9.39652E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.40 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 56 degrees of freedom
# Null hypothesis probability = 3.528500e-01
Photon flux (15-150 keV) in 1 sec: 0.480227 ( -0.110134 0.111386 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
