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 -0.008 sec. to 0.316 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.878879 ( -0.217597 0.229124 )
Norm@50keV : 2.54999E-02 ( -0.00339627 0.00335871 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.934392e-01
Photon flux (15-150 keV) in 0.324 sec: 2.92654 ( -0.38642 0.38749 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.35009e-08 ( -1.26946e-08 1.27457e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.316 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.551069 ( -0.434273 0.978117 )
Epeak [keV] : 265.761 ( -265.762 -265.762 )
Norm@50keV : 3.52336E-02 ( -0.0125358 0.0505261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.83 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 56 degrees of freedom
# Null hypothesis probability = 2.756845e-01
Photon flux (15-150 keV) in 0.324 sec: 2.89685 ( -0.39449 0.39455 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.26092e-08 ( -1.30858e-08 1.30056e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.344 sec. to 0.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.915957 ( -0.32875 0.356974 )
Norm@50keV : 8.35252E-03 ( -0.00162185 0.00158356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.39 using 59 PHA bins.
# Reduced chi-squared = 0.9894 for 57 degrees of freedom
# Null hypothesis probability = 4.977762e-01
Photon flux (15-150 keV) in 1 sec: 0.958859 ( -0.184345 0.185521 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.3173e-08 ( -1.78721e-08 1.7949e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.344 sec. to 0.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.15324 ( -1.68371 2.43828 )
Epeak [keV] : 51.2372 ( )
Norm@50keV : 6.61544E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.17 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 56 degrees of freedom
# Null hypothesis probability = 4.683119e-01
Photon flux (15-150 keV) in 1 sec: 0.963851 ( -0.210813 0.199309 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.35449e-08 ( -2.04057e-08 1.97447e-08 ) ergs/cm2
Time-resolved spectra
