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 -3.984 sec. to 337.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.44179 ( -0.0559068 0.0559262 )
Norm@50keV : 3.16604E-03 ( -9.35941e-05 9.35892e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.69 using 59 PHA bins.
# Reduced chi-squared = 0.9243 for 57 degrees of freedom
# Null hypothesis probability = 6.374903e-01
Photon flux (15-150 keV) in 341.9 sec: 0.389391 ( -0.012515 0.012547 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03755e-05 ( -3.28209e-07 3.28818e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.984 sec. to 337.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.24062 ( -0.212972 0.226753 )
Epeak [keV] : 205.684 ( -80.5734 -205.684 )
Norm@50keV : 3.92176E-03 ( -0.000773815 0.00103748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.15 using 59 PHA bins.
# Reduced chi-squared = 0.8956 for 56 degrees of freedom
# Null hypothesis probability = 6.947670e-01
Photon flux (15-150 keV) in 341.9 sec: 0.383942 ( -0.013709 0.013747 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02303e-05 ( -3.64831e-07 3.62917e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 13.076 sec. to 14.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.12941 ( -0.099488 0.0999643 )
Norm@50keV : 8.14224E-02 ( -0.0044288 0.00442809 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.59 using 59 PHA bins.
# Reduced chi-squared = 0.7822 for 57 degrees of freedom
# Null hypothesis probability = 8.841781e-01
Photon flux (15-150 keV) in 1 sec: 0.391955 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.43568e-07 ( -5.17051e-08 5.19205e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.076 sec. to 14.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.12453 ( -0.146512 0.219001 )
Epeak [keV] : 9999.17 ( -9999.18 -9999.18 )
Norm@50keV : 8.18463E-02 ( -0.00444841 0.0123419 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.62 using 59 PHA bins.
# Reduced chi-squared = 0.7968 for 56 degrees of freedom
# Null hypothesis probability = 8.630299e-01
Photon flux (15-150 keV) in 1 sec: 9.53318 ( -0.59109 0.46742 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10892e-07 ( -3.17201e-08 2.11999e-08 ) ergs/cm2
Time-resolved spectra
