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 6.428 sec. to 359.532 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.77592 ( -0.0880226 0.0871109 )
Norm@50keV : 1.88415E-03 ( -8.98512e-05 8.92481e-05 )
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#Fit statistic : Chi-Squared = 39.55 using 59 PHA bins.
# Reduced chi-squared = 0.6938 for 57 degrees of freedom
# Null hypothesis probability = 9.620763e-01
Photon flux (15-150 keV) in 353.1 sec: 0.257261 ( -0.011742 0.011781 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13165e-06 ( -3.00858e-07 3.03039e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.428 sec. to 359.532 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.77694 ( -0.0871566 0.115928 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 1.88481E-03 ( -0.000585909 0.000738236 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.55 using 59 PHA bins.
# Reduced chi-squared = 0.7063 for 56 degrees of freedom
# Null hypothesis probability = 9.529894e-01
Photon flux (15-150 keV) in 353.1 sec: 0.257902 ( -0.014068 0.012154 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15386e-06 ( -4.05585e-07 2.73573e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 174.376 sec. to 175.376 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.50945 ( -0.180246 0.176503 )
Norm@50keV : 1.94201E-02 ( -0.00205644 0.00203367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.26 using 59 PHA bins.
# Reduced chi-squared = 0.7764 for 57 degrees of freedom
# Null hypothesis probability = 8.911494e-01
Photon flux (15-150 keV) in 1 sec: 2.43067 ( -0.24211 0.24223 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83971e-07 ( -2.15359e-08 2.18359e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 174.376 sec. to 175.376 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.23638 ( -0.426854 0.747469 )
Epeak [keV] : 137.363 ( -137.363 -137.363 )
Norm@50keV : 2.68456E-02 ( -0.0107093 0.0368391 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.75 using 59 PHA bins.
# Reduced chi-squared = 0.7813 for 56 degrees of freedom
# Null hypothesis probability = 8.829475e-01
Photon flux (15-150 keV) in 1 sec: 2.40174 ( -0.25284 0.25163 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79833e-07 ( -2.38275e-08 2.35947e-08 ) ergs/cm2
Time-resolved spectra
