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 -4.056 sec. to 248.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.02025 ( -0.0232508 0.0233575 )
Norm@50keV : 1.66048E-02 ( -0.000228442 0.000227482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 27.93 using 59 PHA bins.
# Reduced chi-squared = 0.4899 for 57 degrees of freedom
# Null hypothesis probability = 9.995803e-01
Photon flux (15-150 keV) in 252.3 sec: 1.91391 ( -0.0277 0.02784 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.49861e-05 ( -5.32467e-07 5.31281e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.056 sec. to 248.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.01355 ( -0.0234432 0.0473298 )
Epeak [keV] : 9997.89 ( -9998.2 -9998.2 )
Norm@50keV : 1.66998E-02 ( -0.000210801 0.000652384 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 28.27 using 59 PHA bins.
# Reduced chi-squared = 0.5048 for 56 degrees of freedom
# Null hypothesis probability = 9.992693e-01
Photon flux (15-150 keV) in 252.3 sec: 1.91293 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.49798e-05 ( -5.31278e-07 5.30251e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 45.144 sec. to 46.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.684462 ( -0.0460264 0.0463159 )
Norm@50keV : 0.127101 ( -0.00322189 0.00320638 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.40 using 59 PHA bins.
# Reduced chi-squared = 0.7614 for 57 degrees of freedom
# Null hypothesis probability = 9.079452e-01
Photon flux (15-150 keV) in 1 sec: 0.964414 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56257e-06 ( -4.17423e-08 4.17833e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 45.144 sec. to 46.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.676081 ( -0.103495 0.0955801 )
Epeak [keV] : 9997.06 ( -9997.25 -9997.25 )
Norm@50keV : 0.128087 ( -0.00304655 0.0165454 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.47 using 59 PHA bins.
# Reduced chi-squared = 0.7762 for 56 degrees of freedom
# Null hypothesis probability = 8.891009e-01
Photon flux (15-150 keV) in 1 sec: 14.7176 ( -0.4006 0.3728 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56426e-06 ( -4.75938e-08 4.34214e-08 ) ergs/cm2
Time-resolved spectra
