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

It has been claimed recently that Swift has captured for the first time alate-time afterglow re-brightening of clear nonflaring origin after the steepdecay of the prompt emission in a long gamma-ray burst (GRB), which may havebeen produced by a narrow jet viewed far off-axis. However, this interpretationof the observed re-brightening of the X-ray afterglow (AG) of GRB081028 isunlikely in view of its large equivalent isotropic gamma-ray energy. Moreover,we show that the late-time re-brightening of the AG of GRB081028 is wellexplained by the cannonball (CB) model of GRBs as a synchrotron flare emittedwhen the jet that produced the GRB in a star formation region (SFR) in the hostgalaxy crossed the SFR boundary into the interstellar medium or the halo of thehost galaxy. We also show that all the other observed properties of GRB081028and its afterglow are well reproduced by the CB model. On the other hand, wedemonstrate that far-off axis GRBs, which in the CB model are `soft' GRBs andXRFs and consequently have much smaller isotropic equivalent gamma-rayenergies, have slowly rising afterglows with a late-time power-law decayidentical to that of ordinary GRBs, in good agreement with the CB modelpredictions.

On re-brightening afterglows of XRFs, Soft GRBs and GRB081028