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 25.572 sec. to 386.864 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.09102 ( -0.160297 0.153755 )
Norm@50keV : 6.83922E-04 ( -7.53294e-05 7.43192e-05 )
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#Fit statistic : Chi-Squared = 70.31 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 57 degrees of freedom
# Null hypothesis probability = 1.108433e-01
Photon flux (15-150 keV) in 361.3 sec: 0.107133 ( -0.0091766 0.009179 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29429e-06 ( -2.29155e-07 2.33368e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 25.572 sec. to 386.864 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.717616 ( -0.82312 1.03427 )
Epeak [keV] : 35.4842 ( -7.27755 6.60606 )
Norm@50keV : 4.69568E-03 ( -0.00469718 0.0161482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.08 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.985053e-01
Photon flux (15-150 keV) in 361.3 sec: 0.102442 ( -0.009448 0.009491 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99723e-06 ( -2.42793e-07 2.6876e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 31.844 sec. to 32.844 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.04449 ( -0.621952 0.540216 )
Norm@50keV : 4.80881E-03 ( -0.00194347 0.00186214 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.59 using 59 PHA bins.
# Reduced chi-squared = 0.9226 for 57 degrees of freedom
# Null hypothesis probability = 6.411046e-01
Photon flux (15-150 keV) in 1 sec: 0.736526 ( -0.241882 0.242334 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.44816e-08 ( -1.6184e-08 1.69144e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.844 sec. to 32.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.51778 ( -5.32612 -3.02951 )
Epeak [keV] : 33.1228 ( -9.60543 178.182 )
Norm@50keV : 81.8338 ( -85.2384 466271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.13 using 59 PHA bins.
# Reduced chi-squared = 0.8952 for 56 degrees of freedom
# Null hypothesis probability = 6.954814e-01
Photon flux (15-150 keV) in 1 sec: 0.643270 ( -0.234367 0.262165 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
