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 -25.184 sec. to 7.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.34553 ( -0.130563 0.130796 )
Norm@50keV : 4.17213E-03 ( -0.000320951 0.000320751 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.25 using 59 bins.
Reduced chi-squared = 1.16228
# Null hypothesis probability of 1.88e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 33 sec: 0.502169 ( -0.039629 0.039695 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34621e-06 ( -1.13749e-07 1.14531e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -25.184 sec. to 7.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.603277 ( -0.564872 0.651061 )
Epeak [keV] : 99.3725 ( -24.2941 135.121 )
Norm@50keV : 9.47915E-03 ( -0.00432397 0.00946029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.05 using 59 bins.
Reduced chi-squared = 1.09018
# Null hypothesis probability of 2.99e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 33 sec: 0.485532 ( -0.041875 0.041682 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28536e-06 ( -1.23576e-07 1.24107e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.184 sec. to 0.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.876445 ( -0.241586 0.254459 )
Norm@50keV : 1.32046E-02 ( -0.00213397 0.00211518 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.18 using 59 bins.
Reduced chi-squared = 1.00316
# Null hypothesis probability of 4.69e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.51543 ( -0.24279 0.24387 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49586e-07 ( -2.43382e-08 2.44464e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.184 sec. to 0.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.480294 ( -1.06303 1.40553 )
Epeak [keV] : 108.900 ( -28.8308 158.641 )
Norm@50keV : 5.01998E-02 ( -0.0319982 0.126383 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 52.11 using 59 bins.
Reduced chi-squared = 0.930536
# Null hypothesis probability of 6.23e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.46245 ( -0.24436 0.24654 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4392e-07 ( -2.5703e-08 2.55918e-08 ) ergs/cm2
Time-resolved spectra
