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 -15.760 sec. to 15.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.01102 ( -0.0622624 0.0629294 )
Norm@50keV : 4.11139E-02 ( -0.00148044 0.00147483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.54 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 57 degrees of freedom
# Null hypothesis probability = 1.600924e-01
Photon flux (15-150 keV) in 31.21 sec: 0.155307 0.164523 0.144737 0.126527 0.110773 9.72879E-02 8.58570E-02 7.62477E-02 6.82233E-02 6.15541E-02 5.60265E-02 5.14490E-02 4.76544E-02 4.45010E-02 4.18706E-02 3.96660E-02 3.78083E-02 3.62337E-02 3.48909E-02 3.37387E-02 3.27440E-02 3.18801E-02 3.11254E-02 3.04625E-02 2.98770E-02 2.93573E-02 2.88938E-02 2.84785E-02 2.81049E-02 2.77674E-02 2.74613E-02 2.71828E-02 2.69285E-02 2.66955E-02 2.64815E-02 2.61032E-02 2.57786E-02 2.54974E-02 2.52518E-02 2.48457E-02 2.18913E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3823e-05 ( -4.89548e-07 4.90396e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.760 sec. to 15.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.93553 ( -0.100726 0.249411 )
Epeak [keV] : 877.049 ( -877.05 -877.05 )
Norm@50keV : 4.41586E-02 ( -0.0016783 0.011376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.26 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 56 degrees of freedom
# Null hypothesis probability = 1.441371e-01
Photon flux (15-150 keV) in 31.21 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37973e-05 ( -4.98446e-07 4.91448e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.120 sec. to 3.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.652143 ( -0.229083 0.246187 )
Norm@50keV : 6.50581E-02 ( -0.00949041 0.00914798 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.12 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.707830e-01
Photon flux (15-150 keV) in 1 sec: 0.794778 ( -0.502035 0.550462 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.11802e-07 ( -1.01374e-07 1.01386e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.120 sec. to 3.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.643392 ( -0.231394 0.248633 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 6.55809E-02 ( -0.0095281 0.00790447 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.14 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 56 degrees of freedom
# Null hypothesis probability = 4.323940e-01
Photon flux (15-150 keV) in 1 sec: 7.59124 ( -1.25987 1.18535 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.11559e-07 ( -1.24317e-07 1.24644e-07 ) ergs/cm2
Time-resolved spectra
