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 -3.844 sec. to 73.792 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.34235 ( -0.0681622 0.0682466 )
Norm@50keV : 4.61898E-03 ( -0.000160989 0.000160979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.78 using 59 bins.
Reduced chi-squared = 0.961053
# Null hypothesis probability of 5.59e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 77.64 sec: 0.555593 ( -0.020577 0.020645 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50902e-06 ( -1.3517e-07 1.3563e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.844 sec. to 73.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.34232 ( -0.0663264 0.0713049 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.62836E-03 ( -0.000161484 0.000876617 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.83 using 59 bins.
Reduced chi-squared = 0.979107
# Null hypothesis probability of 5.19e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 77.64 sec: 0.559488 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5309e-06 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.04678 ( -0.103454 0.104253 )
Norm@50keV : 3.89449E-02 ( -0.00211571 0.00211571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 90.08 using 59 bins.
Reduced chi-squared = 1.58035
# Null hypothesis probability of 3.42e-03 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 4.49692 ( -0.24657 0.24672 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1441e-07 ( -2.66973e-08 2.6886e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.148 sec. to 0.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.04257 ( -0.103477 0.105644 )
Epeak [keV] : 9999.01 ( -9999.09 -9999.09 )
Norm@50keV : 3.91646E-02 ( -0.00212788 0.00738342 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 90.19 using 59 bins.
Reduced chi-squared = 1.61054
# Null hypothesis probability of 2.56e-03 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 4.49570 ( -0.24479 0.24663 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14171e-07 ( -2.67082e-08 2.68812e-08 ) ergs/cm2
Time-resolved spectra
