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 -0.296 sec. to 69.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.27965 ( -0.0336512 0.0337548 )
Norm@50keV : 1.44691E-02 ( -0.00025406 0.000253578 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.88 using 59 PHA bins.
# Reduced chi-squared = 0.6470 for 57 degrees of freedom
# Null hypothesis probability = 9.822591e-01
Photon flux (15-150 keV) in 69.88 sec: 1.71991 ( -0.03415 0.03432 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00432e-05 ( -1.74911e-07 1.74941e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 69.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.2751 ( -0.0340643 0.0338303 )
Epeak [keV] : 9987.99 ( -9995.61 -9995.61 )
Norm@50keV : 1.45301E-02 ( -0.000250643 0.000956574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.01 using 59 PHA bins.
# Reduced chi-squared = 0.6609 for 56 degrees of freedom
# Null hypothesis probability = 9.764362e-01
Photon flux (15-150 keV) in 69.88 sec: 1.73146 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00842e-05 ( -2.18202e-07 1.31334e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 13.888 sec. to 14.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.971151 ( -0.0950125 0.0961522 )
Norm@50keV : 4.25208E-02 ( -0.00227539 0.00226857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.91 using 59 PHA bins.
# Reduced chi-squared = 0.9283 for 57 degrees of freedom
# Null hypothesis probability = 6.291242e-01
Photon flux (15-150 keV) in 1 sec: 0.239311 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64644e-07 ( -2.7132e-08 2.72256e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.888 sec. to 14.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.965115 ( -0.103265 0.353217 )
Epeak [keV] : 9999.99 ( -9999.99 -9999.99 )
Norm@50keV : 4.27842E-02 ( -0.00225586 0.00225075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.91 using 59 PHA bins.
# Reduced chi-squared = 0.9448 for 56 degrees of freedom
# Null hypothesis probability = 5.925905e-01
Photon flux (15-150 keV) in 1 sec: 4.88549 ( -0.26191 0.26671 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64344e-07 ( -2.82501e-08 2.61232e-08 ) ergs/cm2
Time-resolved spectra
