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 0.252 sec. to 56.132 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -1.51636 ( -0.214969 0.213755 )
Norm@50keV : 1.15968E-03 ( -0.000132126 0.000130726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.41 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.599344e-01
Photon flux (15-150 keV) in 55.88 sec: 0.145424 ( -0.016303 0.016361 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.13222e-07 ( -7.70222e-08 7.80146e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.252 sec. to 56.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.24222 ( -0.0863455 0.946285 )
Epeak [keV] : 88.2551 ( )
Norm@50keV : 5.03494E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.26 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 56 degrees of freedom
# Null hypothesis probability = 4.651582e-01
Photon flux (15-150 keV) in 55.88 sec: 0.145410 ( -0.016324 0.016348 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.18709e-07 ( -8.28058e-08 7.22568e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.250 sec. to 1.250 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.94778 ( -0.157323 0.160264 )
Norm@50keV : 1.51740E-02 ( -0.00124851 0.00124428 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.27 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.647724e-01
Photon flux (15-150 keV) in 1 sec: 1.74321 ( -0.14456 0.14505 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67244e-07 ( -1.53292e-08 1.54566e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.250 sec. to 1.250 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.941505 ( -0.230062 0.346287 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 1.52675E-02 ( -0.00123586 0.00622998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.30 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.344573e-01
Photon flux (15-150 keV) in 1 sec: 1.75580 ( -0.15786 0.13173 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67174e-07 ( -1.53432e-08 1.54593e-08 ) ergs/cm2
Time-resolved spectra
