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 1.200 sec. to 11.290 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.29909 ( -0.356661 0.366924 )
Norm@50keV : 1.65959E-03 ( -0.000325784 0.00032455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.66 using 59 PHA bins.
# Reduced chi-squared = 0.7835 for 57 degrees of freedom
# Null hypothesis probability = 8.826203e-01
Photon flux (15-150 keV) in 10.09 sec: 0.197963 ( -0.039236 0.039387 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65527e-07 ( -3.65776e-08 3.72554e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.200 sec. to 11.290 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.29799 ( -0.356188 1.02186 )
Epeak [keV] : 9999.30 ( -9999.36 -9999.36 )
Norm@50keV : 1.66608E-03 ( -0.000327414 0.00362818 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.66 using 59 PHA bins.
# Reduced chi-squared = 0.7976 for 56 degrees of freedom
# Null hypothesis probability = 8.619795e-01
Photon flux (15-150 keV) in 10.09 sec: 0.197942 ( -0.039301 0.039356 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68221e-07 ( -3.90993e-08 3.39785e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.700 sec. to 7.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.995123 ( -0.836192 1.09521 )
Norm@50keV : 2.98093E-03 ( -0.00133361 0.00106877 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.05 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 57 degrees of freedom
# Null hypothesis probability = 2.167613e-01
Photon flux (15-150 keV) in 1 sec: 0.342923 ( -0.342923 0.129949 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.23162e-08 ( -1.28622e-08 1.28912e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.700 sec. to 7.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.34705 ( 3.35726 3.19552 )
Epeak [keV] : 350.621 ( )
Norm@50keV : 2.55593E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.79 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 56 degrees of freedom
# Null hypothesis probability = 2.214703e-01
Photon flux (15-150 keV) in 1 sec: 0.143015 ( -0.143015 0.08461 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.43952e-09 ( -9.43952e-09 4.00948e-09 ) ergs/cm2
Time-resolved spectra
