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 -11.648 sec. to 292.312 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.58334 ( -0.0656361 0.0653594 )
Norm@50keV : 1.98167E-03 ( -6.63333e-05 6.61417e-05 )
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#Fit statistic : Chi-Squared = 55.91 using 59 PHA bins.
# Reduced chi-squared = 0.9809 for 57 degrees of freedom
# Null hypothesis probability = 5.160123e-01
Photon flux (15-150 keV) in 304 sec: 0.253366 ( -0.008805 0.008839 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.64656e-06 ( -2.04243e-07 2.05029e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.648 sec. to 292.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.5819 ( -0.0654635 0.199792 )
Epeak [keV] : 9998.59 ( -9998.98 -9998.98 )
Norm@50keV : 1.98441E-03 ( -6.50804e-05 0.000479222 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.92 using 59 PHA bins.
# Reduced chi-squared = 0.9986 for 56 degrees of freedom
# Null hypothesis probability = 4.777143e-01
Photon flux (15-150 keV) in 304 sec: 0.254179 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67158e-06 ( -3.13071e-07 1.60103e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.456 sec. to 7.456 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.30238 ( -0.0867113 0.0865943 )
Norm@50keV : 3.14592E-02 ( -0.00152852 0.00152595 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.02 using 59 PHA bins.
# Reduced chi-squared = 0.5968 for 57 degrees of freedom
# Null hypothesis probability = 9.932992e-01
Photon flux (15-150 keV) in 1 sec: 3.75485 ( -0.18366 0.18378 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10728e-07 ( -1.71929e-08 1.72993e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.456 sec. to 7.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.18236 ( -0.164531 0.3374 )
Epeak [keV] : 355.416 ( -355.426 -355.426 )
Norm@50keV : 3.60118E-02 ( -0.0058292 0.0160748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.60 using 59 PHA bins.
# Reduced chi-squared = 0.6001 for 56 degrees of freedom
# Null hypothesis probability = 9.923493e-01
Photon flux (15-150 keV) in 1 sec: 3.73359 ( -0.19192 0.19166 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07886e-07 ( -1.88846e-08 1.87695e-08 ) ergs/cm2
Time-resolved spectra
