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 -21.528 sec. to 56.912 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.20609 ( -0.0622731 0.0626119 )
Norm@50keV : 4.34667E-03 ( -0.000145001 0.000144889 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.69 using 59 PHA bins.
# Reduced chi-squared = 0.8192 for 57 degrees of freedom
# Null hypothesis probability = 8.332612e-01
Photon flux (15-150 keV) in 78.44 sec: 0.510654 ( -0.018109 0.018149 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.45356e-06 ( -1.23538e-07 1.23836e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -21.528 sec. to 56.912 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.0604 ( -0.187152 0.251706 )
Epeak [keV] : 366.222 ( -366.222 -366.222 )
Norm@50keV : 5.04801E-03 ( -0.000793094 0.001439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.62 using 59 PHA bins.
# Reduced chi-squared = 0.8147 for 56 degrees of freedom
# Null hypothesis probability = 8.375682e-01
Photon flux (15-150 keV) in 78.44 sec: 0.506054 ( -0.019534 0.019569 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.42285e-06 ( -1.34198e-07 1.33446e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.752 sec. to 1.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.988378 ( -0.0989733 0.0999745 )
Norm@50keV : 3.21506E-02 ( -0.0018103 0.00180728 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.07 using 59 PHA bins.
# Reduced chi-squared = 0.8259 for 57 degrees of freedom
# Null hypothesis probability = 8.228669e-01
Photon flux (15-150 keV) in 1 sec: 3.69930 ( -0.21085 0.21101 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4914e-07 ( -2.18295e-08 2.1925e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.752 sec. to 1.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.799313 ( -0.25854 0.407337 )
Epeak [keV] : 366.374 ( -366.374 -366.374 )
Norm@50keV : 3.90403E-02 ( -0.00822051 0.0193895 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.35 using 59 PHA bins.
# Reduced chi-squared = 0.8277 for 56 degrees of freedom
# Null hypothesis probability = 8.175752e-01
Photon flux (15-150 keV) in 1 sec: 3.67241 ( -0.21762 0.21744 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.46131e-07 ( -2.29246e-08 2.27956e-08 ) ergs/cm2
Time-resolved spectra
