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 -0.092 sec. to 10.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49681 ( -0.229232 0.213116 )
Norm@50keV : 2.27213E-03 ( -0.000362901 0.000359504 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.41 using 59 PHA bins.
# Reduced chi-squared = 0.6738 for 57 degrees of freedom
# Null hypothesis probability = 9.721502e-01
Photon flux (15-150 keV) in 10.23 sec: 0.445552 ( -0.04269 0.042682 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32287e-07 ( -2.68377e-08 2.769e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.092 sec. to 10.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.93383 ( )
Epeak [keV] : 4.20687 ( )
Norm@50keV : 5.13149E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.63 using 59 PHA bins.
# Reduced chi-squared = 0.6899 for 56 degrees of freedom
# Null hypothesis probability = 9.628723e-01
Photon flux (15-150 keV) in 10.23 sec: 0.436200 ( -0.04197 0.041329 ) 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 0.368 sec. to 1.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.37986 ( -0.26804 0.246672 )
Norm@50keV : 6.02994E-03 ( -0.00115824 0.00114505 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.51 using 59 PHA bins.
# Reduced chi-squared = 0.9037 for 57 degrees of freedom
# Null hypothesis probability = 6.803699e-01
Photon flux (15-150 keV) in 1 sec: 1.10281 ( -0.136019 0.13603 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.85693e-08 ( -8.79674e-09 9.10753e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.368 sec. to 1.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.27188 ( -0.726228 1.81645 )
Epeak [keV] : 22.5872 ( )
Norm@50keV : 3.14527E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.33 using 59 PHA bins.
# Reduced chi-squared = 0.8809 for 56 degrees of freedom
# Null hypothesis probability = 7.235977e-01
Photon flux (15-150 keV) in 1 sec: 1.06817 ( -0.13925 0.14064 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
