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    0.000 sec. to   64.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.43792     ( -0.438168   0.433959 )
Norm@50keV  : 3.62584E-04    ( -0.000102864   0.000101693 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.33 using 59 PHA bins.
# Reduced chi-squared =          1.058 for     57 degrees of freedom 
# Null hypothesis probability =   3.563585e-01
 
Photon flux (15-150 keV)    in 64 sec: 4.45499E-02 ( -0.0121254  0.0121434 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.22648e-07 ( -6.80019e-08  7.09005e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.000 sec. to   64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.171823     ( -1.4431   2.72147 )
Epeak [keV] : 64.5510      ( -25.7338 -64.6542 )
Norm@50keV  : 1.81682E-03    ( -0.0017894   0.0953454 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.38 using 59 PHA bins.
# Reduced chi-squared =          1.042 for     56 degrees of freedom 
# Null hypothesis probability =   3.880046e-01
 
Photon flux (15-150 keV)    in 64 sec: 4.29390E-02 ( -0.0063269  0.0121557 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.96404e-07 ( -7.14957e-08  7.74445e-08 ) ergs/cm2
 

1-s peak spectrum fit

1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.

Time-resolved spectra