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 0.568 sec. to 720.568 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.5 ( 1.5 1.5 )
Norm@50keV : 0.0 ( 0 4.25539e-05 )
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#Fit statistic : Chi-Squared = 70.39 using 59 PHA bins.
# Reduced chi-squared = 1.235 for 57 degrees of freedom
# Null hypothesis probability = 1.095918e-01
Photon flux (15-150 keV) in 720 sec: 4.29911E-12 ( -4.29911e-12 0.00363074 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.20828e-28 ( 720 -6.62195e-31 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.568 sec. to 720.568 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: 9.94279 ( )
Epeak [keV] : 44.5214 ( )
Norm@50keV : 43.4657 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.50 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 56 degrees of freedom
# Null hypothesis probability = 1.219986e-01
Photon flux (15-150 keV) in 720 sec: 3.05994E-03 ( -0.00305994 0.00465684 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43963e-07 ( 720 2.073e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 8.068 sec. to 9.068 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.349481 ( -1.30807 0.349445 )
Norm@50keV : 1.92630E-03 ( -0.00192626 0.00145322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.99 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 57 degrees of freedom
# Null hypothesis probability = 4.387097e-01
Photon flux (15-150 keV) in 1 sec: 0.234900 ( -0.2349 0.152951 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80175e-08 ( -1.53928e-08 1.53845e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.068 sec. to 9.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.32465 ( )
Epeak [keV] : 9971.57 ( )
Norm@50keV : 1.93272E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.99 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 56 degrees of freedom
# Null hypothesis probability = 4.019434e-01
Photon flux (15-150 keV) in 1 sec: 0.226563 ( -0.226563 0.155392 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50738e-08 ( -1.30926e-08 1.7271e-08 ) ergs/cm2
Time-resolved spectra
