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 -81.668 sec. to 64.808 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.27276 ( -0.417668 0.360417 )
Norm@50keV : 6.02974E-04 ( -0.000172336 0.000166365 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.98 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.680674e-01
Photon flux (15-150 keV) in 146.5 sec: 0.103813 ( -0.0200045 0.020005 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.40229e-07 ( -1.94876e-07 2.03452e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -81.668 sec. to 64.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.31625 ( -0.762892 2.38053 )
Epeak [keV] : 27.5540 ( )
Norm@50keV : 2.29959E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.86 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 56 degrees of freedom
# Null hypothesis probability = 3.712441e-01
Photon flux (15-150 keV) in 146.5 sec: 0.101251 ( -0.0202655 0.020361 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.75404e-07 ( -1.98614e-07 2.25282e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -49.752 sec. to -48.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.35264 ( -1.07898 1.58497 )
Norm@50keV : 3.59194E-03 ( -0.00359188 0.00178758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.87 using 59 PHA bins.
# Reduced chi-squared = 0.9976 for 57 degrees of freedom
# Null hypothesis probability = 4.800957e-01
Photon flux (15-150 keV) in 1 sec: 0.432916 ( -0.432916 0.238436 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50687e-08 ( -1.85232e-08 1.87694e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -49.752 sec. to -48.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.39617 ( -1.30032 1.64338 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 3.55612E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.87 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 56 degrees of freedom
# Null hypothesis probability = 4.423000e-01
Photon flux (15-150 keV) in 1 sec: 0.440531 ( -0.440531 0.234411 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46265e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
