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 -6.456 sec. to 157.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.10947 ( -0.0596138 0.0589789 )
Norm@50keV : 3.96963E-03 ( -0.000129343 0.000128736 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.31 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.930626e-01
Photon flux (15-150 keV) in 163.9 sec: 0.627516 ( -0.020034 0.020123 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.05173e-06 ( -1.82122e-07 1.82732e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.456 sec. to 157.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.38966 ( -0.268537 0.286184 )
Epeak [keV] : 38.8517 ( -6.19895 4.44912 )
Norm@50keV : 9.45456E-03 ( -0.00257337 0.00384693 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.17 using 59 PHA bins.
# Reduced chi-squared = 0.6994 for 56 degrees of freedom
# Null hypothesis probability = 9.573356e-01
Photon flux (15-150 keV) in 163.9 sec: 0.591572 ( -0.023332 0.023476 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.6387e-06 ( -2.27061e-07 2.29419e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 134.084 sec. to 135.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.19317 ( -0.0841548 0.0823036 )
Norm@50keV : 3.33090E-02 ( -0.001857 0.00184312 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.80 using 59 PHA bins.
# Reduced chi-squared = 1.295 for 57 degrees of freedom
# Null hypothesis probability = 6.653657e-02
Photon flux (15-150 keV) in 1 sec: 5.49525 ( -0.26422 0.2646 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12939e-07 ( -1.56492e-08 1.57158e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 134.084 sec. to 135.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.766801 ( -0.455642 0.514564 )
Epeak [keV] : 35.8961 ( -3.92181 3.22934 )
Norm@50keV : 0.218418 ( -0.0983894 0.215037 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.66 using 59 PHA bins.
# Reduced chi-squared = 0.6724 for 56 degrees of freedom
# Null hypothesis probability = 9.715954e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
