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 12.028 sec. to 34.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.44356 ( -0.20292 0.200632 )
Norm@50keV : 2.68908E-03 ( -0.000305544 0.000303363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.42 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 57 degrees of freedom
# Null hypothesis probability = 1.251110e-01
Photon flux (15-150 keV) in 22.17 sec: 0.330873 ( -0.03696 0.03703 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.7125e-07 ( -7.23704e-08 7.32987e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.028 sec. to 34.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.30323 ( )
Epeak [keV] : 253.945 ( )
Norm@50keV : 3.15706E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.33 using 59 PHA bins.
# Reduced chi-squared = 1.238 for 56 degrees of freedom
# Null hypothesis probability = 1.086373e-01
Photon flux (15-150 keV) in 22.17 sec: 0.328567 ( -0.039362 0.038652 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.65062e-07 ( -8.07833e-08 7.78706e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 31.416 sec. to 32.416 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.65999 ( -0.353295 0.330967 )
Norm@50keV : 7.22888E-03 ( -0.00158985 0.00153741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9574 for 57 degrees of freedom
# Null hypothesis probability = 5.667224e-01
Photon flux (15-150 keV) in 1 sec: 0.947083 ( -0.179113 0.179137 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.71754e-08 ( -1.5342e-08 1.58536e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.416 sec. to 32.416 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.16929 ( -1.11304 1.51679 )
Epeak [keV] : 77.6203 ( -37.0242 -77.6184 )
Norm@50keV : 1.33710E-02 ( -0.0133713 0.0748494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.10 using 59 PHA bins.
# Reduced chi-squared = 0.9661 for 56 degrees of freedom
# Null hypothesis probability = 5.471054e-01
Photon flux (15-150 keV) in 1 sec: 0.930393 ( -0.183583 0.183637 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.42407e-08 ( -1.63887e-08 1.72992e-08 ) ergs/cm2
Time-resolved spectra
