English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Gamma-ray burst are thought to be produced by highly relativistic outflows.Although upper and lower limits for the outflow initial Lorentz factor$\Gamma_0$ are available, observational efforts to derive a directdetermination of $\Gamma_0$ have so far failed or provided ambiguous results.As a matter of fact, the shape of the early-time afterglow light curve isstrongly sensitive on $\Gamma_0$ which determines the time of the afterglowpeak, i.e. when the outflow and the shocked circumburst material share acomparable amount of energy. We now comment early-time observations of thenear-infrared afterglows of GRB 060418 and GRB 060607A performed by the REMrobotic telescope. For both events, the afterglow peak was singled out andallowed us to determine the initial fireball Lorentz, $\Gamma_0\sim 400$.

The afterglow onset for GRB060418 and GRB060607A