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 -5.208 sec. to 90.216 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.23095 ( -0.0496593 0.0498784 )
Norm@50keV : 6.93195E-03 ( -0.000183921 0.000183594 )
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#Fit statistic : Chi-Squared = 49.90 using 59 PHA bins.
# Reduced chi-squared = 0.8754 for 57 degrees of freedom
# Null hypothesis probability = 7.362471e-01
Photon flux (15-150 keV) in 95.42 sec: 0.817397 ( -0.023678 0.023781 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.65426e-06 ( -1.812e-07 1.81387e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.208 sec. to 90.216 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.16658 ( -0.0734339 0.187444 )
Epeak [keV] : 718.068 ( -947.383 -947.383 )
Norm@50keV : 7.38302E-03 ( -0.000798077 0.00138264 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.00 using 59 PHA bins.
# Reduced chi-squared = 0.8929 for 56 degrees of freedom
# Null hypothesis probability = 7.000148e-01
Photon flux (15-150 keV) in 95.42 sec: 0.815460 ( -0.027767 0.026662 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.63788e-06 ( -1.92638e-07 1.82511e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.664 sec. to 7.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.885226 ( -0.065759 0.0663688 )
Norm@50keV : 8.50477E-02 ( -0.00316903 0.00315804 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.70 using 59 PHA bins.
# Reduced chi-squared = 1.468 for 57 degrees of freedom
# Null hypothesis probability = 1.216634e-02
Photon flux (15-150 keV) in 1 sec: 0.461441 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.60086e-07 ( -3.84063e-08 3.85104e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.664 sec. to 7.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.763882 ( -0.148371 0.259882 )
Epeak [keV] : 609.595 ( -609.595 -609.595 )
Norm@50keV : 9.58656E-02 ( -0.00737951 0.0270387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.01 using 59 PHA bins.
# Reduced chi-squared = 1.482 for 56 degrees of freedom
# Null hypothesis probability = 1.102156e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.55586e-07 ( -3.98295e-08 3.96361e-08 ) ergs/cm2
Time-resolved spectra
