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 -26.428 sec. to 53.304 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.32776 ( -0.0353028 0.0354689 )
Norm@50keV : 1.14638E-02 ( -0.000208246 0.000207911 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.36 using 59 PHA bins.
# Reduced chi-squared = 0.6905 for 57 degrees of freedom
# Null hypothesis probability = 9.639220e-01
Photon flux (15-150 keV) in 79.73 sec: 1.37492 ( -0.02863 0.02879 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.97353e-06 ( -1.62601e-07 1.62588e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -26.428 sec. to 53.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.32494 ( -0.0345604 0.0369414 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.14949E-02 ( -0.000207077 0.000901745 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.47 using 59 PHA bins.
# Reduced chi-squared = 0.7048 for 56 degrees of freedom
# Null hypothesis probability = 9.539607e-01
Photon flux (15-150 keV) in 79.73 sec: 1.38370 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.97146e-06 ( -1.62557e-07 1.58562e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 26.644 sec. to 27.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.49451 ( -0.0755105 0.0751313 )
Norm@50keV : 4.56444E-02 ( -0.00193 0.00192615 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.70 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 57 degrees of freedom
# Null hypothesis probability = 1.204613e-01
Photon flux (15-150 keV) in 1 sec: 5.68998 ( -0.2479 0.24829 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.33451e-07 ( -1.98896e-08 1.99683e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.644 sec. to 27.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.28628 ( -0.240841 0.289415 )
Epeak [keV] : 181.401 ( -76.0966 -181.401 )
Norm@50keV : 5.74844E-02 ( -0.0128968 0.0209526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.01 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 56 degrees of freedom
# Null hypothesis probability = 1.304588e-01
Photon flux (15-150 keV) in 1 sec: 5.62625 ( -0.26064 0.26101 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.27829e-07 ( -2.13389e-08 2.12782e-08 ) ergs/cm2
Time-resolved spectra
