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 -1.540 sec. to 191.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.73771 ( -0.0747602 0.0740945 )
Norm@50keV : 3.14244E-03 ( -0.000126327 0.000125852 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.76 using 59 PHA bins.
# Reduced chi-squared = 0.7677 for 57 degrees of freedom
# Null hypothesis probability = 9.011188e-01
Photon flux (15-150 keV) in 192.9 sec: 0.423021 ( -0.017196 0.017267 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59838e-06 ( -2.33598e-07 2.3462e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.540 sec. to 191.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.61299 ( -0.187448 0.293693 )
Epeak [keV] : 154.878 ( -76.1236 -154.878 )
Norm@50keV : 3.62662E-03 ( -0.000591572 0.00141279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.18 using 59 PHA bins.
# Reduced chi-squared = 0.7711 for 56 degrees of freedom
# Null hypothesis probability = 8.951354e-01
Photon flux (15-150 keV) in 192.9 sec: 0.419271 ( -0.019014 0.01903 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.53723e-06 ( -2.69883e-07 2.68436e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 131.588 sec. to 132.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.84691 ( -0.0910035 0.089392 )
Norm@50keV : 3.28403E-02 ( -0.00170681 0.00169346 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.58 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.480333e-01
Photon flux (15-150 keV) in 1 sec: 4.61052 ( -0.22501 0.22546 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02023e-07 ( -1.57568e-08 1.58473e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 131.588 sec. to 132.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.66855 ( -0.171407 0.362025 )
Epeak [keV] : 89.3320 ( -41.3016 -89.332 )
Norm@50keV : 4.06176E-02 ( -0.00808046 0.0213672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.402656e-01
Photon flux (15-150 keV) in 1 sec: 4.56022 ( -0.24331 0.24366 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
