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 -0.984 sec. to 12.164 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.25372 ( -0.238941 0.222453 )
Norm@50keV : 2.13222E-03 ( -0.000346467 0.000339462 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.25 using 59 PHA bins.
# Reduced chi-squared = 0.9869 for 57 degrees of freedom
# Null hypothesis probability = 5.030606e-01
Photon flux (15-150 keV) in 13.15 sec: 0.363308 ( -0.040989 0.041001 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65843e-07 ( -3.57752e-08 3.67827e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.984 sec. to 12.164 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.36334 ( -0.789284 1.28187 )
Epeak [keV] : 27.3063 ( )
Norm@50keV : 7.39775E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.99 using 59 PHA bins.
# Reduced chi-squared = 0.9641 for 56 degrees of freedom
# Null hypothesis probability = 5.513589e-01
Photon flux (15-150 keV) in 13.15 sec: 0.351295 ( -0.042717 0.042953 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42754e-07 ( -3.82954e-08 4.36739e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.236 sec. to 1.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.04033 ( -0.346018 0.317234 )
Norm@50keV : 6.81711E-03 ( -0.00141991 0.00133567 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.48 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.207775e-01
Photon flux (15-150 keV) in 1 sec: 1.04208 ( -0.156199 0.15633 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.30347e-08 ( -1.15759e-08 1.19444e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.236 sec. to 1.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.36627 ( 0 0.718871 )
Epeak [keV] : 137.497 ( )
Norm@50keV : 4.51184E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.89 using 59 PHA bins.
# Reduced chi-squared = 0.9980 for 56 degrees of freedom
# Null hypothesis probability = 4.790081e-01
Photon flux (15-150 keV) in 1 sec: 0.966006 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
