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 -0.012 sec. to 9.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.17416 ( -0.3039 0.272504 )
Norm@50keV : 3.33738E-03 ( -0.000797009 0.000842413 )
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#Fit statistic : Chi-Squared = 60.96 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.355056e-01
Photon flux (15-150 keV) in 9.452 sec: 1.04496 ( -0.114004 0.11402 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.12861e-07 ( -5.32075e-08 5.51695e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.012 sec. to 9.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.823352 ( -1.5616 2.15025 )
Epeak [keV] : 14.8495 ( -14.2426 6.97238 )
Norm@50keV : 0.144340 ( -0.152651 5.0998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.25 using 59 PHA bins.
# Reduced chi-squared = 0.9510 for 56 degrees of freedom
# Null hypothesis probability = 5.794347e-01
Photon flux (15-150 keV) in 9.452 sec: 1.01187 ( -0.113623 0.11388 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.73511e-07 ( -4.67021e-08 5.04967e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.032 sec. to 1.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.83634 ( -0.200532 0.186671 )
Norm@50keV : 1.98356E-02 ( -0.00314318 0.00316919 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.28 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.581407e-01
Photon flux (15-150 keV) in 1 sec: 4.85682 ( -0.46862 0.4687 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22177e-07 ( -2.38919e-08 2.42339e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.032 sec. to 1.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.0972727 ( -1.36841 1.70122 )
Epeak [keV] : 22.6922 ( -6.46625 3.4344 )
Norm@50keV : 1.85712 ( -2.5168 33.3202 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.53 using 59 PHA bins.
# Reduced chi-squared = 0.7059 for 56 degrees of freedom
# Null hypothesis probability = 9.532723e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
