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 -24.776 sec. to 139.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.59937 ( -0.032958 0.0329704 )
Norm@50keV : 1.01026E-02 ( -0.000171658 0.000171632 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 62.80 using 59 bins.
Reduced chi-squared = 1.10175
# Null hypothesis probability of 2.78e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 164.6 sec: 1.29802 ( -0.02669 0.02681 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5555e-05 ( -2.65971e-07 2.65854e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.776 sec. to 139.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.32031 ( -0.137782 0.141794 )
Epeak [keV] : 139.775 ( -28.2586 76.9879 )
Norm@50keV : 1.33576E-02 ( -0.00168251 0.00198321 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.61 using 59 bins.
Reduced chi-squared = 0.90375
# Null hypothesis probability of 6.78e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 164.6 sec: 1.26382 ( -0.0308 0.03105 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52781e-05 ( -2.98191e-07 2.97299e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 50.188 sec. to 51.188 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.33133 ( -0.0719705 0.071686 )
Norm@50keV : 5.08271E-02 ( -0.00217725 0.00217589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 72.33 using 59 bins.
Reduced chi-squared = 1.26895
# Null hypothesis probability of 8.30e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 6.10028 ( -0.26445 0.26461 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.98597e-07 ( -2.38196e-08 2.39075e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 50.188 sec. to 51.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.611207 ( -0.306053 0.329429 )
Epeak [keV] : 102.451 ( -17.1284 36.7916 )
Norm@50keV : 0.112528 ( -0.0315361 0.0478343 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 54.60 using 59 bins.
Reduced chi-squared = 0.975
# Null hypothesis probability of 5.28e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 5.91916 ( -0.27463 0.27464 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.78355e-07 ( -2.58014e-08 2.57604e-08 ) ergs/cm2
Time-resolved spectra
