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 0.536 sec. to 136.536 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.922876 ( -0.259623 0.278402 )
Norm@50keV : 1.05344E-03 ( -0.00017188 0.00016851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 41.61 using 59 bins.
Reduced chi-squared = 0.73
# Null hypothesis probability of 9.37e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 136 sec: 0.120948 ( -0.019614 0.01984 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59396e-06 ( -2.44535e-07 2.45155e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.536 sec. to 136.536 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.000621513 ( -1.02511 1.6384 )
Epeak [keV] : 135.977 ( -48.9967 -135.976 )
Norm@50keV : 2.45608E-03 ( -0.00151618 0.0070187 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 39.86 using 59 bins.
Reduced chi-squared = 0.711786
# Null hypothesis probability of 9.49e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 136 sec: 0.115562 ( -0.0208783 0.021037 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5485e-06 ( -2.59152e-07 2.55805e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 5.536 sec. to 6.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.721122 ( -0.609661 0.773142 )
Norm@50keV : 6.41471E-03 ( -0.00285567 0.00258868 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.15 using 59 bins.
Reduced chi-squared = 0.879825
# Null hypothesis probability of 7.28e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.740310 ( -0.283578 0.29512 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.75711e-08 ( -2.61561e-08 2.61626e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.536 sec. to 6.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.454702 ( 0.454702 2.66288 )
Epeak [keV] : 406.066 ( -406.066 -406.066 )
Norm@50keV : 7.97030E-03 ( -0.00426102 0.135579 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.12 using 59 bins.
Reduced chi-squared = 0.895
# Null hypothesis probability of 6.96e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.731593 ( -0.290053 0.290277 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.75658e-08 ( -2.63115e-08 2.62205e-08 ) ergs/cm2
Time-resolved spectra
