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 -4.832 sec. to 311.296 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.50078 ( -0.0598692 0.0596992 )
Norm@50keV : 2.40760E-03 ( -7.33652e-05 7.33105e-05 )
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#Fit statistic : Chi-Squared = 43.96 using 59 PHA bins.
# Reduced chi-squared = 0.7712 for 57 degrees of freedom
# Null hypothesis probability = 8.971696e-01
Photon flux (15-150 keV) in 316.1 sec: 0.300633 ( -0.009824 0.009864 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.21963e-06 ( -2.38197e-07 2.38922e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.832 sec. to 311.296 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.47105 ( -0.0561833 0.227132 )
Epeak [keV] : 939.528 ( -9999.35 -9999.35 )
Norm@50keV : 2.48719E-03 ( -7.34498e-05 0.000642959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.02 using 59 PHA bins.
# Reduced chi-squared = 0.7862 for 56 degrees of freedom
# Null hypothesis probability = 8.769420e-01
Photon flux (15-150 keV) in 316.1 sec: 0.300703 ( -0.011036 0.009767 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.22127e-06 ( -2.75277e-07 2.3436e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.700 sec. to 2.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.38422 ( -0.115982 0.115197 )
Norm@50keV : 2.20194E-02 ( -0.00155886 0.00155261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.66 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 57 degrees of freedom
# Null hypothesis probability = 9.153157e-02
Photon flux (15-150 keV) in 1 sec: 2.67214 ( -0.18325 0.1833 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13491e-07 ( -1.70736e-08 1.72422e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.700 sec. to 2.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.827513 ( -0.468925 0.527111 )
Epeak [keV] : 101.763 ( -28.9011 241.656 )
Norm@50keV : 4.30238E-02 ( -0.018208 0.0371095 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.47 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 56 degrees of freedom
# Null hypothesis probability = 1.400961e-01
Photon flux (15-150 keV) in 1 sec: 2.61641 ( -0.1898 0.18937 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03007e-07 ( -1.93616e-08 1.94213e-08 ) ergs/cm2
Time-resolved spectra
