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Relativistic Transient Explosions

by Tsvi Piran (Racah Institute of Physics, Jerusalem, Israel)

Jan 31, 2013 from 02:00 PM to 04:00 PM

Where Seminars' room, floor -1, via Ranzani 1

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Among the most interesting fireworks observed on the sky are the brightest
- gamma ray bursts, GRBs, the least known - neutron star mergers, and the
recently observed puzzling tidal disruption events. I present new results
on GRBs progenitors, demonstrating on one hand the existence of a new
group of objects: low-luminosity GRBs and providing on the other hand the
first direct observational evidence for the Collapsar mechanism. I examine
the links between these conclusions and short GRBs that are expected to
arise from neutron star mergers and I predict the existence of long
lasting flares from merger events. These could help identify gravitational
radiation emission from mergers events, increasing the effective
sensitivity of gravitational radiation detectors by a large factors.  I
examine the puzzling Swift events: J1644 and J2058 and explain why they
were observed in non-thermal X-ray and not in the expected thermal UV. I
also demonstrate surprising (theoretical) links between these three
unrelated objects.