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 -24.088 sec. to 384.988 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.8241 ( -0.100644 0.0989145 )
Norm@50keV : 1.21174E-03 ( -6.93572e-05 6.86786e-05 )
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#Fit statistic : Chi-Squared = 76.81 using 59 PHA bins.
# Reduced chi-squared = 1.347 for 57 degrees of freedom
# Null hypothesis probability = 4.126035e-02
Photon flux (15-150 keV) in 409.1 sec: 0.168570 ( -0.008549 0.008561 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.5611e-06 ( -2.63957e-07 2.66817e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.088 sec. to 384.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.61094 ( -0.290032 0.39488 )
Epeak [keV] : 83.4516 ( -29.4864 -83.4516 )
Norm@50keV : 1.57494E-03 ( -0.000417384 0.000957598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.82 using 59 PHA bins.
# Reduced chi-squared = 1.354 for 56 degrees of freedom
# Null hypothesis probability = 4.005293e-02
Photon flux (15-150 keV) in 409.1 sec: 0.166210 ( -0.009414 0.009415 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.45236e-06 ( -3.18844e-07 3.2139e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 341.784 sec. to 342.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.85918 ( -0.300983 0.278597 )
Norm@50keV : 7.15213E-03 ( -0.00141261 0.00136215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.49 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 57 degrees of freedom
# Null hypothesis probability = 3.511722e-01
Photon flux (15-150 keV) in 1 sec: 1.00914 ( -0.153374 0.15337 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.57658e-08 ( -1.25929e-08 1.30494e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 341.784 sec. to 342.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.64629 ( -0.612359 1.11655 )
Epeak [keV] : 70.4830 ( -67.9057 -70.4819 )
Norm@50keV : 9.49044E-03 ( -0.00949053 0.0328985 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.33 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 56 degrees of freedom
# Null hypothesis probability = 3.221352e-01
Photon flux (15-150 keV) in 1 sec: 1.00155 ( -0.156429 0.15661 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
