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 -15.036 sec. to 47.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.08572 ( -0.0749813 0.0738729 )
Norm@50keV : 5.70478E-03 ( -0.000234604 0.000232899 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.66 using 59 PHA bins.
# Reduced chi-squared = 0.6607 for 57 degrees of freedom
# Null hypothesis probability = 9.775503e-01
Photon flux (15-150 keV) in 62.45 sec: 0.891310 ( -0.034842 0.034995 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.30623e-06 ( -1.25676e-07 1.26208e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.036 sec. to 47.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.91665 ( -0.17478 0.308917 )
Epeak [keV] : 22.7086 ( -20.9684 27.2246 )
Norm@50keV : 7.00540E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.67 using 59 PHA bins.
# Reduced chi-squared = 0.6548 for 56 degrees of freedom
# Null hypothesis probability = 9.787289e-01
Photon flux (15-150 keV) in 62.45 sec: 0.879768 ( -0.039735 0.037141 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 35.072 sec. to 36.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.97037 ( -0.151224 0.145685 )
Norm@50keV : 2.02823E-02 ( -0.00197016 0.00193653 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.89 using 59 PHA bins.
# Reduced chi-squared = 0.9455 for 57 degrees of freedom
# Null hypothesis probability = 5.923430e-01
Photon flux (15-150 keV) in 1 sec: 3.00186 ( -0.24693 0.24711 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86819e-07 ( -1.72994e-08 1.74865e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 35.072 sec. to 36.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.63316 ( -0.55225 0.638772 )
Epeak [keV] : 47.6538 ( )
Norm@50keV : 3.13839E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.85 using 59 PHA bins.
# Reduced chi-squared = 0.9437 for 56 degrees of freedom
# Null hypothesis probability = 5.949192e-01
Photon flux (15-150 keV) in 1 sec: 2.96580 ( -0.25431 0.25412 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
