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 0.000 sec. to 67.200 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.2066 ( -0.172663 0.176171 )
Norm@50keV : 1.23197E-03 ( -0.000120636 0.000120576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 0.9846 for 57 degrees of freedom
# Null hypothesis probability = 5.080599e-01
Photon flux (15-150 keV) in 67.2 sec: 0.144745 ( -0.014763 0.014813 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.38454e-07 ( -8.94587e-08 9.01468e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 67.200 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.676179 ( -0.603852 0.83648 )
Epeak [keV] : 135.290 ( -52.453 -135.29 )
Norm@50keV : 2.17884E-03 ( -0.00101228 0.0029647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.47 using 59 PHA bins.
# Reduced chi-squared = 0.9726 for 56 degrees of freedom
# Null hypothesis probability = 5.331319e-01
Photon flux (15-150 keV) in 67.2 sec: 0.140810 ( -0.015783 0.015682 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.08329e-07 ( -9.95521e-08 9.88633e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 45.100 sec. to 46.100 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.33275 ( -0.698633 0.759588 )
Norm@50keV : 3.12031E-03 ( -0.00101044 0.000977442 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.79 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 57 degrees of freedom
# Null hypothesis probability = 1.759211e-01
Photon flux (15-150 keV) in 1 sec: 0.374588 ( -0.120435 0.120691 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06027e-08 ( -1.11392e-08 1.15621e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 45.100 sec. to 46.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.37122 ( -0.332495 2.48573 )
Epeak [keV] : 358.355 ( )
Norm@50keV : 3.30445E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.02 using 59 PHA bins.
# Reduced chi-squared = 1.161 for 56 degrees of freedom
# Null hypothesis probability = 1.914820e-01
Photon flux (15-150 keV) in 1 sec: 0.207930 ( -0.20793 0.076997 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
