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 -0.032 sec. to 0.308 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -0.811237 ( -0.151354 0.155697 )
Norm@50keV : 0.102950 ( -0.0090348 0.00898819 )
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#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.846414e-01
Photon flux (15-150 keV) in 0.34 sec: 11.8277 ( -1.0235 1.0244 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.07164e-07 ( -3.89762e-08 3.92003e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.804452 ( -0.218164 0.333144 )
Epeak [keV] : 9999.12 ( -9999.13 -9999.13 )
Norm@50keV : 0.103692 ( -0.00894746 0.0438786 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.54 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 56 degrees of freedom
# Null hypothesis probability = 3.482039e-01
Photon flux (15-150 keV) in 0.34 sec: 11.8533 ( -1.2518 1.1978 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.09805e-07 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from -0.360 sec. to 0.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.858172 ( -0.186452 0.19448 )
Norm@50keV : 3.66062E-02 ( -0.00384205 0.0037955 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.26 using 59 PHA bins.
# Reduced chi-squared = 0.9871 for 57 degrees of freedom
# Null hypothesis probability = 5.027013e-01
Photon flux (15-150 keV) in 1 sec: 0.207362 ( -0.03839 0.244898 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17705e-07 ( -4.53647e-08 4.55392e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.360 sec. to 0.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.862986 ( -0.177433 0.335293 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.69215E-02 ( -0.00411767 0.012894 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.32 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 56 degrees of freedom
# Null hypothesis probability = 4.626967e-01
Photon flux (15-150 keV) in 1 sec: 4.23550 ( -0.46987 0.40087 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18958e-07 ( 0 0 ) ergs/cm2
Time-resolved spectra
