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 -45.792 sec. to 19.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.65211 ( -0.211822 0.20646 )
Norm@50keV : 1.00924E-03 ( -0.000124899 0.000121976 )
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#Fit statistic : Chi-Squared = 50.60 using 59 PHA bins.
# Reduced chi-squared = 0.8877 for 57 degrees of freedom
# Null hypothesis probability = 7.124045e-01
Photon flux (15-150 keV) in 65.1 sec: 0.131878 ( -0.014262 0.014271 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.11e-07 ( -8.04441e-08 8.2108e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -45.792 sec. to 19.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.34026 ( -0.212691 0.207772 )
Epeak [keV] : 121.196 ( -9999.35 -9999.36 )
Norm@50keV : 4.49728E-04 ( -0.000222765 0.000271684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.31 using 59 PHA bins.
# Reduced chi-squared = 0.8805 for 56 degrees of freedom
# Null hypothesis probability = 7.244030e-01
Photon flux (15-150 keV) in 65.1 sec: 0.132108 ( -0.01477 0.014222 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17335e-07 ( -8.69013e-08 7.54704e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.992 sec. to 1.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.08048 ( -0.382626 0.39534 )
Norm@50keV : 5.03971E-03 ( -0.000997909 0.000994747 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.63 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 57 degrees of freedom
# Null hypothesis probability = 1.583756e-01
Photon flux (15-150 keV) in 1 sec: 0.583516 ( -0.118698 0.119103 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.30298e-08 ( -1.17013e-08 1.18157e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.992 sec. to 1.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.07203 ( -0.387636 0.396212 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.06610E-03 ( -0.000995881 0.0101882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.64 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 56 degrees of freedom
# Null hypothesis probability = 1.370855e-01
Photon flux (15-150 keV) in 1 sec: 0.583426 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.3108e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
