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 -3.244 sec. to 4.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.87319 ( -0.289999 0.270707 )
Norm@50keV : 2.95798E-03 ( -0.000560058 0.000541102 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.95 using 59 PHA bins.
# Reduced chi-squared = 0.9464 for 57 degrees of freedom
# Null hypothesis probability = 5.903835e-01
Photon flux (15-150 keV) in 7.448 sec: 0.419776 ( -0.062349 0.062352 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02563e-07 ( -3.71e-08 3.8267e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.244 sec. to 4.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.73113 ( -0.553564 1.53323 )
Epeak [keV] : 77.7763 ( -78.0184 -78.0379 )
Norm@50keV : 3.58886E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.90 using 59 PHA bins.
# Reduced chi-squared = 0.9625 for 56 degrees of freedom
# Null hypothesis probability = 5.547012e-01
Photon flux (15-150 keV) in 7.448 sec: 0.417716 ( -0.064827 0.063516 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98916e-07 ( -4.73437e-08 4.07187e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.17818 ( -0.448305 0.387264 )
Norm@50keV : 5.27434E-03 ( -0.00163537 0.00157845 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.654886e-01
Photon flux (15-150 keV) in 1 sec: 0.863375 ( -0.17399 0.174065 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.94527e-08 ( -1.27769e-08 1.35879e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.140 sec. to 1.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.74607 ( 1.99005 1.99005 )
Epeak [keV] : 21.6495 ( )
Norm@50keV : 9.93478E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 56 degrees of freedom
# Null hypothesis probability = 4.339410e-01
Photon flux (15-150 keV) in 1 sec: 0.863075 ( -0.17302 0.174455 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
