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: -1.88318     ( -0.487721   0.447071 )
Norm@50keV  : 4.90585E-04    ( -0.000163138   0.000159576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.26 using 59 PHA bins.
# Reduced chi-squared =          1.198 for     57 degrees of freedom 
# Null hypothesis probability =   1.459750e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.99154E-02 ( -0.019829  0.0198682 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.88543e-07 ( -9.2121e-08  9.67494e-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: 0.136743     ( -2.06573   -0.156986 )
Epeak [keV] : 41.0167      (   )
Norm@50keV  : 8.03600E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.40 using 59 PHA bins.
# Reduced chi-squared =          1.168 for     56 degrees of freedom 
# Null hypothesis probability =   1.827714e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.69766E-02 ( -0.0196665  0.0198033 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.40458e-07 ( -1.11903e-07  1.06303e-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