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 0.168 sec. to 36.792 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.89223 ( -0.374249 0.344352 )
Norm@50keV : 2.27124E-03 ( -0.000522515 0.000498601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.73 using 59 PHA bins.
# Reduced chi-squared = 0.8549 for 57 degrees of freedom
# Null hypothesis probability = 7.740993e-01
Photon flux (15-150 keV) in 36.62 sec: 0.324897 ( -0.06001 0.060058 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.64765e-07 ( -1.67443e-07 1.72707e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.168 sec. to 36.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.89247 ( )
Epeak [keV] : 9999.16 ( )
Norm@50keV : 2.27217E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.73 using 59 PHA bins.
# Reduced chi-squared = 0.8702 for 56 degrees of freedom
# Null hypothesis probability = 7.439363e-01
Photon flux (15-150 keV) in 36.62 sec: 0.325938 ( -0.063032 0.060564 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.70049e-07 ( -1.78081e-07 1.28824e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.492 sec. to 1.492 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.893892 ( -0.601316 0.686477 )
Norm@50keV : 8.43425E-03 ( -0.0030785 0.00285363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.26 using 59 PHA bins.
# Reduced chi-squared = 0.7590 for 57 degrees of freedom
# Null hypothesis probability = 9.105124e-01
Photon flux (15-150 keV) in 1 sec: 0.968013 ( -0.330753 0.339177 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.48899e-08 ( -3.07187e-08 3.0852e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.492 sec. to 1.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.896011 ( -0.599183 0.700208 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 8.50147E-03 ( -0.00282104 0.0663482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.26 using 59 PHA bins.
# Reduced chi-squared = 0.7725 for 56 degrees of freedom
# Null hypothesis probability = 8.934256e-01
Photon flux (15-150 keV) in 1 sec: 0.972524 ( -0.343549 0.338016 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.49883e-08 ( -3.12926e-08 3.11683e-08 ) ergs/cm2
Time-resolved spectra
