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 -0.380 sec. to 87.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.23418 ( -0.142007 0.143858 )
Norm@50keV : 1.56571E-03 ( -0.000116875 0.000116875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.87 using 59 PHA bins.
# Reduced chi-squared = 0.9100 for 57 degrees of freedom
# Null hypothesis probability = 6.673021e-01
Photon flux (15-150 keV) in 87.45 sec: 0.184717 ( -0.014347 0.014402 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37626e-06 ( -1.15103e-07 1.15913e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.380 sec. to 87.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.2317 ( -0.141564 0.150446 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.57268E-03 ( -0.000117271 0.000261829 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.92 using 59 PHA bins.
# Reduced chi-squared = 0.9271 for 56 degrees of freedom
# Null hypothesis probability = 6.300525e-01
Photon flux (15-150 keV) in 87.45 sec: 0.184678 ( -0.014363 0.014389 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38599e-06 ( -1.25583e-07 1.05571e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.224 sec. to 0.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.26971 ( -0.192364 0.193715 )
Norm@50keV : 1.12958E-02 ( -0.00132048 0.00131826 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.71 using 59 PHA bins.
# Reduced chi-squared = 0.9949 for 57 degrees of freedom
# Null hypothesis probability = 4.860121e-01
Photon flux (15-150 keV) in 1 sec: 1.34040 ( -0.15706 0.15719 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12484e-07 ( -1.47805e-08 1.49543e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.224 sec. to 0.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.502472 ( -0.81784 1.06251 )
Epeak [keV] : 95.3305 ( -31.8112 -95.3071 )
Norm@50keV : 2.81523E-02 ( -0.0171974 0.0712627 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9678 for 56 degrees of freedom
# Null hypothesis probability = 5.434173e-01
Photon flux (15-150 keV) in 1 sec: 1.30242 ( -0.16398 0.1631 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04894e-07 ( -1.75124e-08 1.72606e-08 ) ergs/cm2
Time-resolved spectra
