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 bursts (GRBs) are the most powerful explosions in the universe andprobe physics under extreme conditions. GRBs divide into two classes, of shortand long duration, thought to originate from different types of progenitorsystems. The physics of their gamma-ray emission is still poorly known, over 40years after their discovery, but may be probed by their highest-energy photons.Here we report the first detection of high-energy emission from a short GRBwith measured redshift, GRB 090510, using the Fermi Gamma-ray Space Telescope.We detect for the first time a GRB prompt spectrum with a significant deviationfrom the Band function. This can be interpreted as two distinct spectralcomponents, which challenge the prevailing gamma-ray emission mechanism:synchrotron - synchrotron self-Compton. The detection of a 31 GeV photon duringthe first second sets the highest lower limit on a GRB outflow Lorentz factor,of >1200, suggesting that the outflows powering short GRBs are at least ashighly relativistic as those powering long GRBs. Even more importantly, thisphoton sets limits on a possible linear energy dependence of the propagationspeed of photons (Lorentz-invariance violation) requiring for the first time aquantum-gravity mass scale significantly above the Planck mass.

Testing Einstein's special relativity with Fermi's short hard gamma-ray burst GRB090510