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    1.400 sec. to   11.507 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52137     ( -0.0982996   0.0977094 )
Norm@50keV  : 3.17057E-02    ( -0.0017671   0.00176364 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.84 using 59 PHA bins.
# Reduced chi-squared =         0.8393 for     57 degrees of freedom 
# Null hypothesis probability =   8.009587e-01
 
Photon flux (15-150 keV)    in 10.11 sec: 3.98140 ( -0.23255  0.23327 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.0309e-06 ( -1.80397e-07  1.80996e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.400 sec. to   11.507 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.4542     ( -0.129044   0.383237 )
Epeak [keV] : 397.397      ( -767.502 -767.502 )
Norm@50keV  : 3.41450E-02    ( -0.00286631   0.016532 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.90 using 59 PHA bins.
# Reduced chi-squared =         0.8553 for     56 degrees of freedom 
# Null hypothesis probability =   7.709480e-01
 
Photon flux (15-150 keV)    in 10.11 sec: 3.97475 ( -0.24185  0.23037 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.02567e-06 ( -1.88855e-07  1.795e-07 ) 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