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 32.584 sec. to 200.228 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.62789 ( -0.0564148 0.0562322 )
Norm@50keV : 4.41652E-03 ( -0.000123623 0.000123473 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.04 using 59 PHA bins.
# Reduced chi-squared = 0.8428 for 57 degrees of freedom
# Null hypothesis probability = 7.950532e-01
Photon flux (15-150 keV) in 167.6 sec: 0.572576 ( -0.017639 0.017707 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.9012e-06 ( -2.03678e-07 2.04128e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.584 sec. to 200.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.6255 ( -0.0572048 0.104876 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.42202E-03 ( -0.000124114 0.000505835 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.09 using 59 PHA bins.
# Reduced chi-squared = 0.8587 for 56 degrees of freedom
# Null hypothesis probability = 7.649038e-01
Photon flux (15-150 keV) in 167.6 sec: 0.572492 ( -0.017642 0.017712 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.97516e-06 ( -2.78873e-07 1.28857e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 146.056 sec. to 147.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.45336 ( -0.118749 0.117684 )
Norm@50keV : 2.24557E-02 ( -0.00160199 0.00159588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.11 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.990448e-01
Photon flux (15-150 keV) in 1 sec: 2.76973 ( -0.194 0.19411 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14778e-07 ( -1.69399e-08 1.70789e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 146.056 sec. to 147.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.999132 ( -0.451765 0.504644 )
Epeak [keV] : 111.078 ( -34.8947 4691.82 )
Norm@50keV : 3.80753E-02 ( -0.0151975 0.0292961 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.15 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 56 degrees of freedom
# Null hypothesis probability = 3.612720e-01
Photon flux (15-150 keV) in 1 sec: 2.72113 ( -0.2002 0.20002 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08113e-07 ( -1.83245e-08 1.83723e-08 ) ergs/cm2
Time-resolved spectra
