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 -3.072 sec. to 11.320 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.10335 ( -0.272778 0.251012 )
Norm@50keV : 2.82832E-03 ( -0.000495423 0.000475503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 49.32 using 59 bins.
Reduced chi-squared = 0.865263
# Null hypothesis probability of 7.55e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 14.39 sec: 0.445744 ( -0.054118 0.054129 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7833e-07 ( -5.75256e-08 5.92429e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.072 sec. to 11.320 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.2217 ( -0.0260408 0.512639 )
Epeak [keV] : 94.7499 ( )
Norm@50keV : 2.35289E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 48.76 using 59 bins.
Reduced chi-squared = 0.870714
# Null hypothesis probability of 7.43e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 14.39 sec: 0.392704 ( -0.11046 0.097471 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8295e-07 ( -6.19454e-08 6.39818e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.14401 ( -0.388553 0.339978 )
Norm@50keV : 6.63864E-03 ( -0.00179891 0.00174122 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 73.46 using 59 bins.
Reduced chi-squared = 1.28877
# Null hypothesis probability of 7.01e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.06780 ( -0.208043 0.20804 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.19812e-08 ( -1.45461e-08 1.51464e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.020 sec. to 1.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.4576 ( -1.54763 2.24824 )
Epeak [keV] : 36.7594 ( -32.4586 16.3248 )
Norm@50keV : 6.58539E-02 ( -0.0658794 1.31726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 70.38 using 59 bins.
Reduced chi-squared = 1.25679
# Null hypothesis probability of 9.36e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.03042 ( -0.208087 0.20947 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.57905e-08 ( -1.30066e-08 1.52474e-08 ) ergs/cm2
Time-resolved spectra
