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 -2.360 sec. to 254.152 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.20471 ( -0.0620998 0.0624752 )
Norm@50keV : 3.31535E-03 ( -0.000110739 0.000110518 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.68 using 59 bins.
Reduced chi-squared = 1.01193
# Null hypothesis probability of 4.50e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 256.5 sec: 0.389416 ( -0.014019 0.014078 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.61701e-06 ( -2.98853e-07 2.99341e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.360 sec. to 254.152 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.21109 ( -0.065591 0.0698211 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.29438E-03 ( -0.000109395 0.000799508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.13 using 59 bins.
Reduced chi-squared = 1.03804
# Null hypothesis probability of 3.97e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 256.5 sec: 0.389779 ( -0.016022 0.014311 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.62179e-06 ( -3.17403e-07 2.60145e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 3.284 sec. to 4.284 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.796065 ( -0.103183 0.105511 )
Norm@50keV : 6.92398E-02 ( -0.00445557 0.0044306 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.85 using 59 bins.
Reduced chi-squared = 0.962281
# Null hypothesis probability of 5.56e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.385569 ( 0.027832 0.116535 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1055e-07 ( -5.30197e-08 5.31442e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.284 sec. to 4.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.26947 ( -0.422733 0.469069 )
Epeak [keV] : 201.344 ( -66.3747 489.098 )
Norm@50keV : 0.115221 ( -0.0379208 0.0620249 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.23 using 59 bins.
Reduced chi-squared = 0.896964
# Null hypothesis probability of 6.92e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 7.85617 ( -0.5079 0.50842 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.01475e-07 ( -5.47856e-08 5.45964e-08 ) ergs/cm2
Time-resolved spectra
