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 21.096 sec. to 117.736 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.24462 ( -0.142607 0.136883 )
Norm@50keV : 1.19428E-03 ( -0.000113898 0.000112442 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.47 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.577727e-01
Photon flux (15-150 keV) in 96.64 sec: 0.202495 ( -0.013616 0.013622 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09269e-06 ( -8.70853e-08 8.86563e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.096 sec. to 117.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.71238 ( -0.285744 0.668133 )
Epeak [keV] : 20.7564 ( -19.6721 12.4673 )
Norm@50keV : 2.50301E-03 ( -0.000999333 0.00385774 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.94 using 59 PHA bins.
# Reduced chi-squared = 0.9811 for 56 degrees of freedom
# Null hypothesis probability = 5.148766e-01
Photon flux (15-150 keV) in 96.64 sec: 0.202476 ( -0.013674 0.013728 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02536e-06 ( -1.04875e-07 1.11107e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 59.412 sec. to 60.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.83598 ( -0.46419 0.417389 )
Norm@50keV : 3.44213E-03 ( -0.00105243 0.00100201 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.13 using 59 PHA bins.
# Reduced chi-squared = 1.318 for 57 degrees of freedom
# Null hypothesis probability = 5.406302e-02
Photon flux (15-150 keV) in 1 sec: 0.481125 ( -0.115912 0.115913 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.16621e-08 ( -9.30888e-09 9.7598e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 59.412 sec. to 60.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.35373 ( -0.843789 2.45181 )
Epeak [keV] : 55.1262 ( )
Norm@50keV : 6.63619E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.92 using 59 PHA bins.
# Reduced chi-squared = 1.338 for 56 degrees of freedom
# Null hypothesis probability = 4.648465e-02
Photon flux (15-150 keV) in 1 sec: 0.474922 ( -0.117945 0.118033 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9964e-08 ( -1.00623e-08 9.32672e-09 ) ergs/cm2
Time-resolved spectra
