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 -0.512 sec. to 16.636 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.63624 ( -0.238134 0.23135 )
Norm@50keV : 2.91385E-03 ( -0.000405661 0.000395467 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 38.55 using 59 bins.
Reduced chi-squared = 0.65339
# Null hypothesis probability of 9.71e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 17.15 sec: 0.378782 ( -0.046518 0.046546 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.65484e-07 ( -6.90558e-08 7.05157e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.512 sec. to 16.636 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.64654 ( -0.231296 0.273497 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 2.89780E-03 ( -0.00142125 0.0025597 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 38.55 using 59 bins.
Reduced chi-squared = 0.65339
# Null hypothesis probability of 9.71e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 17.15 sec: 0.379345 ( -0.047672 0.046432 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.6991e-07 ( -9.49076e-08 8.73067e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.25998 ( -0.276665 0.283544 )
Norm@50keV : 1.14338E-02 ( -0.00174626 0.0017442 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.25 using 59 bins.
Reduced chi-squared = 0.733051
# Null hypothesis probability of 9.11e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.35454 ( -0.21101 0.21156 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14146e-07 ( -1.96682e-08 1.98895e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.23432 ( -0.0617722 1.48252 )
Epeak [keV] : 82.2825 ( )
Norm@50keV : 3.10478E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.25 using 59 bins.
Reduced chi-squared = 0.733051
# Null hypothesis probability of 9.11e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.36392 ( -0.28387 0.26504 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15792e-07 ( 0 0 ) ergs/cm2
Time-resolved spectra
