Rapid fading of optical afterglows as evidence for beaming in gamma-ray bursts - INSPIRE

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Rapid fading of optical afterglows as evidence for beaming in gamma-ray bursts

Feb, 2000

5 pages

Published in:

Astron.Astrophys. 355 (2000) L43

e-Print:

astro-ph/0002433 [astro-ph]

View in:

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Abstract: (arXiv)

Based on the refined dynamical model proposed by us earlier for beamed

\gamma

-ray burst ejecta, we carry out detailed numerical procedure to study those

\gamma

-ray bursts with rapidly fading afterglows (i.e.,

\sim t^{-2}

). It is found that optical afterglows from GRB 970228, 980326, 980519, 990123, 990510 and 991208 can be satisfactorily fitted if the

\gamma

-ray burst ejecta are highly collimated, with a universal initial half opening angle

\theta_0 \sim 0.1

. The obvious light curve break observed in GRB 990123 is due to the relativistic-Newtonian transition of the beamed ejecta, and the rapidly fading optical afterglows come from synchrotron emissions during the mildly relativistic and non-relativistic phases. We strongly suggest that the rapid fading of afterglows currently observed in some

\gamma

-ray bursts is evidence for beaming in these cases.

References(33)

Figures(0)

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