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Implications of Lag-Luminosity Relationship for Unified GRB Paradigms
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Spectral lags are deduced for 1437 long GRBs with peak fluxes extending to near the BATSE trigger threshold. The lags are modeled to approximate the observed distribution in the peak flux-lag plane, realizing a noise-free representation. Assuming a two-branch lag-luminosity relationship, the lags are self- consistently corrected for cosmological effects to yield distributions in luminosity, distance, and redshift. The results have several consequences for GRB populations -- including a possible nearby subpopulation of low-luminosity, long-lag GRBs -- and for unified gamma-ray/afterglow scenarios which would account for afterglow break times and gamma-ray spectral evolution in terms of jet opening angle, viewing angle, or a profiled jet with variable Lorentz factor.
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Cited by 1 Pith paper
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On the Duration of Gamma-Ray Bursts
GRB duration is shaped by the progenitor, the central engine, the emitter, and geometry, so short versus long duration is not a reliable direct indicator of what exploded or merged.
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