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 -0.200 sec. to 13.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.43909 ( -0.0971864 0.0968579 )
Norm@50keV : 9.17556E-03 ( -0.000488026 0.000486297 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.95 using 59 bins.
Reduced chi-squared = 1.05175
# Null hypothesis probability of 3.69e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 13.21 sec: 1.12776 ( -0.06046 0.06058 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16239e-06 ( -6.8782e-08 6.92444e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.200 sec. to 13.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.30578 ( -0.183188 0.394728 )
Epeak [keV] : 265.724 ( -265.975 -265.975 )
Norm@50keV : 1.06780E-02 ( -0.00192314 0.00586828 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.58 using 59 bins.
Reduced chi-squared = 1.06393
# Null hypothesis probability of 3.47e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 13.21 sec: 1.11906 ( -0.06501 0.06481 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14898e-06 ( -7.84408e-08 7.69412e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 6.580 sec. to 7.580 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.10452 ( -0.151309 0.153743 )
Norm@50keV : 2.25137E-02 ( -0.00194657 0.00194628 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 62.37 using 59 bins.
Reduced chi-squared = 1.09421
# Null hypothesis probability of 2.91e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.61259 ( -0.23022 0.23046 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35072e-07 ( -2.286e-08 2.30589e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.580 sec. to 7.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.859342 ( -0.320213 0.674033 )
Epeak [keV] : 250.851 ( -250.868 -250.868 )
Norm@50keV : 2.94452E-02 ( -0.00855239 0.0307103 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.89 using 59 bins.
Reduced chi-squared = 1.10518
# Null hypothesis probability of 2.74e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.58626 ( -0.23977 0.23895 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31143e-07 ( -2.52934e-08 2.47097e-08 ) ergs/cm2
Time-resolved spectra
