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 -33.336 sec. to 170.028 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.55975 ( -0.162894 0.162121 )
Norm@50keV : 2.61946E-03 ( -0.000223514 0.000223388 )
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#Fit statistic : Chi-Squared = 49.62 using 59 PHA bins.
# Reduced chi-squared = 0.8705 for 57 degrees of freedom
# Null hypothesis probability = 7.456018e-01
Photon flux (15-150 keV) in 203.4 sec: 0.332560 ( -0.031625 0.031865 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.00958e-06 ( -4.46048e-07 4.47761e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -33.336 sec. to 170.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.71002 ( -0.162146 0.345504 )
Epeak [keV] : 232.430 ( -9999.36 -9999.36 )
Norm@50keV : 6.80408E-04 ( -0.000680419 0.000820627 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.26 using 59 PHA bins.
# Reduced chi-squared = 0.8618 for 56 degrees of freedom
# Null hypothesis probability = 7.593445e-01
Photon flux (15-150 keV) in 203.4 sec: 0.332565 ( -0.03167 0.031831 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03769e-06 ( -4.75525e-07 4.18644e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 43.800 sec. to 44.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.52716 ( -2.4346 5.05047 )
Norm@50keV : 7.14361E-03 ( -0.00704237 0.00570705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.31 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.358706e-01
Photon flux (15-150 keV) in 1 sec: 1.43064 ( -1.43064 0.648 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0531e-08 ( -3.85332e-08 4.74766e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 43.800 sec. to 44.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.13686 ( -0.838277 1.93217 )
Epeak [keV] : 65.6990 ( )
Norm@50keV : 7.54353E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.19 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 56 degrees of freedom
# Null hypothesis probability = 2.113628e-01
Photon flux (15-150 keV) in 1 sec: 0.988082 ( -0.651627 0.730718 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92674e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
