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 -57.068 sec. to 8.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.52916 ( -0.342262 0.302367 )
Norm@50keV : 6.68679E-04 ( -0.000162841 0.000161379 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.30 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.361666e-01
Photon flux (15-150 keV) in 65.31 sec: 0.133760 ( -0.019923 0.019926 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.40311e-07 ( -7.8035e-08 8.11594e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -57.068 sec. to 8.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.971485 ( -1.03341 1.95914 )
Epeak [keV] : 24.1197 ( )
Norm@50keV : 6.22704E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.97 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 56 degrees of freedom
# Null hypothesis probability = 3.018696e-01
Photon flux (15-150 keV) in 65.31 sec: 0.128331 ( -0.020277 0.020381 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.36495e-07 ( -7.59255e-08 8.6731e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 4.060 sec. to 5.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.85688 ( -1.07122 0.709216 )
Norm@50keV : 2.18960E-03 ( -0.00138491 0.00143663 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.12 using 59 PHA bins.
# Reduced chi-squared = 0.8618 for 57 degrees of freedom
# Null hypothesis probability = 7.616864e-01
Photon flux (15-150 keV) in 1 sec: 0.543852 ( -0.162858 0.163035 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47281e-08 ( -9.28552e-09 1.03051e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.060 sec. to 5.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.91013 ( )
Epeak [keV] : 3.33894 ( )
Norm@50keV : 8.78447E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.45 using 59 PHA bins.
# Reduced chi-squared = 0.8831 for 56 degrees of freedom
# Null hypothesis probability = 7.192669e-01
Photon flux (15-150 keV) in 1 sec: 0.518391 ( -0.222541 0.188363 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
