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 -0.896 sec. to 22.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.24394 ( -0.376932 0.387174 )
Norm@50keV : 1.01434E-03 ( -0.000194738 0.000194725 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.51 using 59 PHA bins.
# Reduced chi-squared = 0.9739 for 57 degrees of freedom
# Null hypothesis probability = 5.311241e-01
Photon flux (15-150 keV) in 23 sec: 0.119853 ( -0.0239637 0.024037 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33887e-07 ( -5.04454e-08 5.10034e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.896 sec. to 22.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.79054 ( -1.23623 2.11208 )
Epeak [keV] : 237.791 ( )
Norm@50keV : 1.76748E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.49 using 59 PHA bins.
# Reduced chi-squared = 0.9730 for 56 degrees of freedom
# Null hypothesis probability = 5.322887e-01
Photon flux (15-150 keV) in 23 sec: 0.119883 ( -0.024016 0.023987 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33448e-07 ( -5.08153e-08 5.20403e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.104 sec. to 1.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.62703 ( -0.554258 0.695139 )
Norm@50keV : 3.32321E-03 ( -0.00121276 0.00106957 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.61 using 59 PHA bins.
# Reduced chi-squared = 0.7826 for 57 degrees of freedom
# Null hypothesis probability = 8.836512e-01
Photon flux (15-150 keV) in 1 sec: 0.386778 ( -0.115037 0.117417 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.19585e-08 ( -1.16559e-08 1.1694e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.104 sec. to 1.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.629935 ( -0.547615 1.02222 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.36287E-03 ( -0.00122972 0.0106336 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.62 using 59 PHA bins.
# Reduced chi-squared = 0.7968 for 56 degrees of freedom
# Null hypothesis probability = 8.630138e-01
Photon flux (15-150 keV) in 1 sec: 0.386741 ( -0.115143 0.117292 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.19276e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
