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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The prompt emission of Gamma Ray Bursts extends from the early pulsesobserved in gamma-rays (>15 keV) to very late flares of X-ray photons (0.3-10keV). The duration of prompt gamma-ray pulses is rather constant while thewidth of X-ray flares correlates with their peak time suggesting a possibledifferent origin. However, pulses and flares have similar spectral properties.Considering internal and external shock scenarios, we derive how the energy andduration of pulses scale with their time of occurrence and we compare withobservations. The absence of an observed correlation between prompt emissionpulse duration and its time of occurrence favours an "internal" origin andconfirms the earlier results of Ramirez-Ruiz & Fenimore. We show that also theenergetic and temporal properties of X-ray flares are consistent with beingproduced by internal shocks between slow fireballs with a small contrastbetween their bulk Lorentz factors. These results relax the requirement of along lasting central engine to explain the latest X-ray flares.

From the earliest pulses to the latest flares in long GRBs