Volume 367, Number 2, February IV 2001
|Page(s)||501 - 505|
|Section||Interstellar and circumstellar matter|
|Published online||15 February 2001|
Could the unusual optical afterglow of GRB 000301c arise from a non-relativistic shock with energy injection?
Department of Astronomy, Nanjing University, Nanjing 210093, PR China
Corresponding author: T. Lu, firstname.lastname@example.org
Accepted: 13 November 2000
Recent observations on the gamma-ray burst (GRB) 000301c afterglow show that one sharp break appears in the global optical/IR light curves, and in particular the decay slope at late times is as steep as about -3.0. This unusual feature is clearly inconsistent with the standard afterglow shock model. Here we propose a non-standard model for the afterglow of GRB 000301c, in which an initial ultra-relativistic shock in a dense medium ("dirty environment") rapidly evolved to the non-relativistic phase in 1 day after the burst. During such a phase, the shock was refreshed by a strongly magnetized millisecond pulsar through magnetic dipole radiation. This refreshment led to flattening of the light curves. After the energy injection, the afterglow decayed as if the electron distribution index of the shocked medium, , derived from the optical spectrum. Therefore, our model can provide a plausible explanation for the peculiar optical/IR afterglow light curves of GRB 000301c.
Key words: gamma-rays: bursts / shock waves
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.