Bumps in the optical afterglow of GRB 030329: refreshed shocks and evidence for internal shocks in GRBs?

Details Bumps in the optical afterglow of GRB 030329: refreshed shocks and evidence for internal shocks in GRBs? Bumps in the optical afterglow of GRB 030329: refreshed shocks and evidence for internal shocks in GRBs?

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..836..353g&link_type=abstract

GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. AIP Conference Proceedings, Volume 836, pp. 353-

Astronomy and Astrophysics

Astrophysics

Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

The afterglow of GRB 030329 presents a high variability, made of approximately constant duration bumps, which we explain by a series of late energy injections from slow shells (refreshed shocks). We model the GRB 030329 afterglow assuming that the central source first emits rapid material (Γ ~ 100) immediately followed by slower one (Γ ~ 10), which can catch up with the rapid material when it has been decelerated by the external medium. We fit the afterglow lightcurve, and extract from this fit some evidence that internal shocks must have occurred previously in the ejecta.

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