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GRB time-dilation measurements corrected for trigger bias.
- Source :
-
AIP Conference Proceedings . 2000, Vol. 526 Issue 1, p210. 5p. 1 Chart, 2 Graphs. - Publication Year :
- 2000
-
Abstract
- 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. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GAMMA ray bursts
*TIME dilation
Subjects
Details
- Language :
- English
- ISSN :
- 0094243X
- Volume :
- 526
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- AIP Conference Proceedings
- Publication Type :
- Conference
- Accession number :
- 6028723