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 9.884 sec. to 79.836 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.10778 ( -0.158197 0.151397 )
Norm@50keV : 1.81000E-03 ( -0.000185319 0.000181853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.27 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.942253e-01
Photon flux (15-150 keV) in 69.95 sec: 0.285883 ( -0.022473 0.022487 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17746e-06 ( -1.07624e-07 1.09358e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.884 sec. to 79.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.73145 ( -0.381898 0.669807 )
Epeak [keV] : 29.6799 ( -27.9058 39.7576 )
Norm@50keV : 2.98466E-03 ( -0.001762 0.0042531 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.06 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 56 degrees of freedom
# Null hypothesis probability = 2.989902e-01
Photon flux (15-150 keV) in 69.95 sec: 0.281189 ( -0.023605 0.023587 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13266e-06 ( -1.2485e-07 1.28204e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 46.944 sec. to 47.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.61741 ( -0.513158 0.483781 )
Norm@50keV : 4.68169E-03 ( -0.00141236 0.0013628 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.44 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.599820e-01
Photon flux (15-150 keV) in 1 sec: 0.604929 ( -0.168565 0.169034 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.36999e-08 ( -1.36371e-08 1.40538e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 46.944 sec. to 47.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.19792 ( -1.12558 2.68563 )
Epeak [keV] : 91.9415 ( -91.9806 -91.9806 )
Norm@50keV : 7.77564E-03 ( -0.00777203 0.158427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.30 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.344643e-01
Photon flux (15-150 keV) in 1 sec: 0.595528 ( -0.175848 0.1739 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23292e-08 ( -1.45045e-08 1.50243e-08 ) ergs/cm2
Time-resolved spectra
