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 0.000 sec. to 0.960 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.592714 ( -0.454056 0.544973 )
Norm@50keV : 2.02170E-02 ( -0.00621943 0.00558269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.71 using 59 PHA bins.
# Reduced chi-squared = 0.9774 for 57 degrees of freedom
# Null hypothesis probability = 5.234674e-01
Photon flux (15-150 keV) in 0.96 sec: 2.36251 ( -0.60184 0.6054 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49087e-07 ( -5.91803e-08 5.90265e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.592102 ( -0.449906 0.558376 )
Epeak [keV] : 9999.33 ( -9999.36 -9999.36 )
Norm@50keV : 2.04442E-02 ( -0.00574807 0.028536 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.73 using 59 PHA bins.
# Reduced chi-squared = 0.9953 for 56 degrees of freedom
# Null hypothesis probability = 4.848814e-01
Photon flux (15-150 keV) in 0.96 sec: 2.36252 ( -0.60222 0.6046 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47595e-07 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.244 sec. to 0.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.832574 ( -0.403544 0.451085 )
Norm@50keV : 2.17172E-02 ( -0.00534911 0.00511521 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.77 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.104526e-01
Photon flux (15-150 keV) in 1 sec: 2.49369 ( -0.58495 0.58897 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50403e-07 ( -5.84168e-08 5.85839e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.244 sec. to 0.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.751486 ( )
Epeak [keV] : 911.261 ( )
Norm@50keV : 2.36097E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.88 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 56 degrees of freedom
# Null hypothesis probability = 3.705705e-01
Photon flux (15-150 keV) in 1 sec: 2.49325 ( -0.58485 0.58881 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.12838e-09 ( 0 0 ) ergs/cm2
Time-resolved spectra
