We measure time-dilation factors (TDFs) for 1158 long gamma-ray bursts (GRBs) using a peak-alignment method. Our standard corrections for noise bias and spectral redshift are implemented. Also for the first time we account for trigger bias against detecting relatively short, low signal-to-noise GRBs using a retriggering procedure which approximates the on-board BATSE algorithm on the 1024-ms timescale. This procedure implicitly addresses any bias that would be introduced when comparing bright bursts with dim bursts. The retriggering step significantly reduces the relative TDFs between the 10% brightest bursts and the 30% dimmest bursts. These corrected TDFs are compared with Monte Carlo simulations of a distribution of GRBs adopting standard cosmologies, GRB luminosity functions, and GRB rate-density evolution with cosmic time. Statistically, the corrected GRB TDFs are consistent with the expected extrinsic cosmological time dilation.
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8 September 2000
GAMMA-RAY BURSTS: 5th Huntsville Symposium
18-22 Oct 1999
Huntsville, Alabama (USA)
Research Article|
September 08 2000
GRB time-dilation measurements corrected for trigger bias
Jerry T. Bonnell;
Jerry T. Bonnell
1NASA Goddard Space Flight Center, Greenbelt, Maryland 20771
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Jay P. Norris;
Jay P. Norris
1NASA Goddard Space Flight Center, Greenbelt, Maryland 20771
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Gabriela F. Marani;
Gabriela F. Marani
1NASA Goddard Space Flight Center, Greenbelt, Maryland 20771
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Robert J. Nemiroff
Robert J. Nemiroff
2Department of Physics, Michigan Technological University, Michigan 49931
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AIP Conf. Proc. 526, 210–214 (2000)
Citation
Jerry T. Bonnell, Jay P. Norris, Gabriela F. Marani, Robert J. Nemiroff; GRB time-dilation measurements corrected for trigger bias. AIP Conf. Proc. 8 September 2000; 526 (1): 210–214. https://doi.org/10.1063/1.1361536
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