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

Recent observations with Swift have begun to uncover $\gamma$-ray transientswhose total energies are comparable to those of gamma-ray bursts (GRB), buthave a duration an order of magnitude or more longer than the bulk of the GRBpopulation. Some are suggested to form a new population of ultra-long GRBs,with a mean duration around $10^4$s, while a further population with$\gamma-$ray durations $>10^5$ s may represent manifestations of relativisticoutflows from stars shredded around massive black holes in tidal disruptionflares (TDFs). Here I review the observations of these new classes of events,discuss progress towards identifying their progenitors and suggest how newobservations may both hone our understanding of the outbursts, and allow themto be used as probes, that offer both complementary and additional tools toGRBs.

Swift discoveries of new populations of extremely long duration high energy transient