Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914202y&link_type=abstract
American Astronomical Society, AAS Meeting #219, #142.02
Astronomy and Astrophysics
Astronomy
Scientific paper
We compare the intrinsic gamma-ray variability (V) of γ-ray bursts (GRBs) to properties of their subsequent optical afterglow onset and find that a more comprehensive dataset than our previous work does not show statistically significant correlations between V and the onset time or peak shape. We fit 30 afterglow onset optical peaks, including the early rising lightcurve of GRB 080804; the fits yielded peak times as well as rise times, fall times and widths. We also used constraints from 47 early (t < 1 ksec) optical detections where the lightcurve was already in decline. A generalized Spearman rank test shows no significant evidence for correlation of V with the peak time, width, rise, decay, or ratio of rise to decay times, both for times de-redshifted or referenced to the GRB duration. As the optical onset time is an indicator of the external shock's Lorentz factor Γ, this result implies that there is no particular correlation between the diverse outcomes of the prompt γ-ray emission processes and the initial Γ.
Moore T. M.
Yost Sarah
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