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 -20.812 sec. to 104.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.83538 ( -0.122132 0.119303 )
Norm@50keV : 1.64484E-03 ( -0.000115207 0.000113692 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.94 using 59 PHA bins.
# Reduced chi-squared = 0.7182 for 57 degrees of freedom
# Null hypothesis probability = 9.463526e-01
Photon flux (15-150 keV) in 125.8 sec: 0.229852 ( -0.014024 0.014051 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9034e-06 ( -1.33864e-07 1.35518e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.812 sec. to 104.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.70508 ( -0.246069 0.469274 )
Epeak [keV] : 104.195 ( )
Norm@50keV : 1.93049E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.68 using 59 PHA bins.
# Reduced chi-squared = 0.7264 for 56 degrees of freedom
# Null hypothesis probability = 9.384025e-01
Photon flux (15-150 keV) in 125.8 sec: 0.227982 ( -0.01527 0.015181 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76109e-06 ( -1.77796e-07 1.37501e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 11.268 sec. to 12.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.46054 ( -0.341095 0.335075 )
Norm@50keV : 6.06180E-03 ( -0.00122674 0.00120385 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.40 using 59 PHA bins.
# Reduced chi-squared = 0.9719 for 57 degrees of freedom
# Null hypothesis probability = 5.353561e-01
Photon flux (15-150 keV) in 1 sec: 0.749022 ( -0.142415 0.142488 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.79029e-08 ( -1.29032e-08 1.3261e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.268 sec. to 12.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.25468 ( -1.39582 1.43315 )
Epeak [keV] : 171.420 ( -172.222 -172.222 )
Norm@50keV : 7.80297E-03 ( -0.00779484 0.0364659 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.31 using 59 PHA bins.
# Reduced chi-squared = 0.9876 for 56 degrees of freedom
# Null hypothesis probability = 5.010487e-01
Photon flux (15-150 keV) in 1 sec: 0.743026 ( -0.146573 0.146018 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67336e-08 ( -1.45027e-08 1.41425e-08 ) ergs/cm2
Time-resolved spectra
