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  -28.376 sec. to   43.624 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.15346     ( -0.243953   0.224855 )
Norm@50keV  : 1.31491E-03    ( -0.000215435   0.000209037 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.42 using 59 PHA bins.
# Reduced chi-squared =         0.8319 for     57 degrees of freedom 
# Null hypothesis probability =   8.131543e-01
 
Photon flux (15-150 keV)    in 72 sec: 0.212519 ( -0.024619  0.024621 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.84894e-07 ( -1.25019e-07  1.28183e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -28.376 sec. to   43.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.83517     ( -0.244607   1.00152 )
Epeak [keV] : 21.3061      (   )
Norm@50keV  : 2.01917E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.02 using 59 PHA bins.
# Reduced chi-squared =         0.8396 for     56 degrees of freedom 
# Null hypothesis probability =   7.981175e-01
 
Photon flux (15-150 keV)    in 72 sec: 0.210154 ( -0.025389  0.025073 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.58305e-07 ( -1.38222e-07  1.43729e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   11.388 sec. to   12.388 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.07282     ( -0.726946   0.586847 )
Norm@50keV  : 4.13290E-03    ( -0.00184598   0.00168768 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.01 using 59 PHA bins.
# Reduced chi-squared =          1.123 for     57 degrees of freedom 
# Null hypothesis probability =   2.439772e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.641678 ( -0.198823  0.198827 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.83116e-08 ( -1.44604e-08  1.53347e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   11.388 sec. to   12.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.98828     (       )
Epeak [keV] : 11.9811      (   )
Norm@50keV  : 4.45372E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.05 using 59 PHA bins.
# Reduced chi-squared =          1.144 for     56 degrees of freedom 
# Null hypothesis probability =   2.149296e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.618501 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Time-resolved spectra