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 -31.384 sec. to 13.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.67611 ( -0.122542 0.121268 )
Norm@50keV : 4.26102E-03 ( -0.000300071 0.000298398 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.78 using 59 PHA bins.
# Reduced chi-squared = 0.9611 for 57 degrees of freedom
# Null hypothesis probability = 5.588192e-01
Photon flux (15-150 keV) in 44.9 sec: 0.561293 ( -0.03941 0.039495 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7752e-06 ( -1.31029e-07 1.31871e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.384 sec. to 13.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.53162 ( -0.253305 0.463946 )
Epeak [keV] : 160.014 ( )
Norm@50keV : 5.05197E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.45 using 59 PHA bins.
# Reduced chi-squared = 0.9723 for 56 degrees of freedom
# Null hypothesis probability = 5.337658e-01
Photon flux (15-150 keV) in 44.9 sec: 0.557234 ( -0.041138 0.041169 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75581e-06 ( -1.43578e-07 1.42545e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 2.636 sec. to 3.636 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.71022 ( -0.247582 0.239026 )
Norm@50keV : 1.48442E-02 ( -0.00214954 0.00211034 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.59 using 59 PHA bins.
# Reduced chi-squared = 1.361 for 57 degrees of freedom
# Null hypothesis probability = 3.621833e-02
Photon flux (15-150 keV) in 1 sec: 1.97865 ( -0.2728 0.27376 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37354e-07 ( -2.05736e-08 2.07417e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.636 sec. to 3.636 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.70423 ( -0.459754 0.238231 )
Epeak [keV] : 9998.88 ( -9999.34 -9999.35 )
Norm@50keV : 1.48873E-02 ( -0.00216514 0.0224145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.59 using 59 PHA bins.
# Reduced chi-squared = 1.386 for 56 degrees of freedom
# Null hypothesis probability = 2.964243e-02
Photon flux (15-150 keV) in 1 sec: 1.98946 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37683e-07 ( -2.13294e-08 1.60616e-08 ) ergs/cm2
Time-resolved spectra
