Kinematics of Gamma-Ray Bursts and their Relationship to Afterglows

Mathematics – Logic

Scientific paper

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Scientific paper

We report a strong correlation between gamma-ray burst (GRB) pulse lags and afterglow jet-break times for bursts with known redshifts and with observed breaks in their afterglows. This may be a valuable clue toward understanding the connection between the burst and afterglow phases of these events. The relation is roughly linear (i.e. doubling the pulse lag in turn doubles the jet break time) and thus implies a simple relationship between these quantities. We suggest that this relationship is due to variation among bursts of emitter Lorentz factor. Specifically, an increased velocity of burst ejecta will result in shorter perceived pulse lags in the GRB as well as quicker evolution of the external shock of the afterglow to the time when the jet becomes obvious, i.e. the jet-break time. We speculate as to whether this is a true variation among GRBs or a perspective effect due to different observer angles of a morphologically homogeneous population of GRBs.

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