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 -1.152 sec. to 26.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.20924 ( -0.116885 0.118338 )
Norm@50keV : 4.15141E-03 ( -0.000276928 0.00027683 )
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#Fit statistic : Chi-Squared = 51.07 using 59 PHA bins.
# Reduced chi-squared = 0.8959 for 57 degrees of freedom
# Null hypothesis probability = 6.960511e-01
Photon flux (15-150 keV) in 27.65 sec: 0.487936 ( -0.033957 0.034028 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16168e-06 ( -8.4231e-08 8.46599e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.152 sec. to 26.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.882772 ( -0.377945 0.513239 )
Epeak [keV] : 185.639 ( -82.1833 -185.65 )
Norm@50keV : 5.91483E-03 ( -0.0019238 0.00422566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.63 using 59 PHA bins.
# Reduced chi-squared = 0.8862 for 56 degrees of freedom
# Null hypothesis probability = 7.131925e-01
Photon flux (15-150 keV) in 27.65 sec: 0.480747 ( -0.035487 0.035482 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13803e-06 ( -9.21928e-08 9.13445e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.140 sec. to 5.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.07331 ( -0.278272 0.29191 )
Norm@50keV : 9.37467E-03 ( -0.00149089 0.00148533 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.67 using 59 PHA bins.
# Reduced chi-squared = 0.7486 for 57 degrees of freedom
# Null hypothesis probability = 9.207944e-01
Photon flux (15-150 keV) in 1 sec: 1.08476 ( -0.177196 0.17794 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.88758e-08 ( -1.69633e-08 1.70927e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.140 sec. to 5.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.07927 ( -0.273612 0.346258 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 9.42247E-03 ( -0.00147432 0.0166643 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.68 using 59 PHA bins.
# Reduced chi-squared = 0.7622 for 56 degrees of freedom
# Null hypothesis probability = 9.049928e-01
Photon flux (15-150 keV) in 1 sec: 1.08818 ( -0.192089 0.18424 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.92796e-08 ( -1.88992e-08 1.79966e-08 ) ergs/cm2
Time-resolved spectra
