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 -6.808 sec. to 42.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.93816 ( -0.168107 0.162118 )
Norm@50keV : 2.05555E-03 ( -0.000228242 0.000224231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.11 using 59 bins.
Reduced chi-squared = 1.13746
# Null hypothesis probability of 1.69e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 48.98 sec: 0.299908 ( -0.026494 0.026498 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.26403e-07 ( -9.85203e-08 1.00499e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.808 sec. to 42.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.5193 ( -0.644622 0.833739 )
Epeak [keV] : 45.7428 ( )
Norm@50keV : 3.65961E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.11 using 59 bins.
Reduced chi-squared = 1.13746
# Null hypothesis probability of 1.69e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 48.98 sec: 0.295118 ( -0.027622 0.027512 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.76757e-07 ( -1.24322e-07 1.26053e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -1.720 sec. to -0.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.65155 ( -0.443277 0.434506 )
Norm@50keV : 5.64772E-03 ( -0.00155838 0.00150348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.29 using 59 bins.
Reduced chi-squared = 0.971017
# Null hypothesis probability of 4.64e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.737859 ( -0.178583 0.178649 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.25255e-08 ( -1.49184e-08 1.56048e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.720 sec. to -0.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.65122 ( )
Epeak [keV] : 9999.25 ( )
Norm@50keV : 5.65708E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.29 using 59 bins.
Reduced chi-squared = 0.971017
# Null hypothesis probability of 4.64e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.737533 ( -0.178277 0.178915 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.28689e-08 ( -3.09318e-08 1.12609e-08 ) ergs/cm2
Time-resolved spectra
