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SUMMARY:Gamma Ray Bursts - A Puzzle Being Resolved
DTSTART;VALUE=DATE-TIME:19990715T143000Z
DTEND;VALUE=DATE-TIME:19990715T144500Z
DTSTAMP;VALUE=DATE-TIME:20130525T152105Z
UID:indico-event-a032756@cern.ch
DESCRIPTION:Gamma Ray Bursts (GRBs)\, short and intense bursts of Gamma-Ra
 ys\, have puzzled astrophysicists since their accidental discovery in the 
 seventies. BATSE\, launched in 1991\, has established the cosmological ori
 gin of GRBs and has shown that they involve energies much higher than prev
 iously expected\, corresponding to the most powerful explosions known in t
 he Universe. The fireball model\, which has been developed during the last
  ten years\, explains most of the observed features of GRBs. According to 
 this model\, GRBs are produced in internal collisions of ejected matter fl
 owing at ultra-relativistic energy. This ultra-relativistic motion reaches
  Lorentz factors of order 100 or more\, higher than seen elsewhere in the 
 Universe. The GRB afterglow was discovered in 1997. This model predicted i
 t and it takes place when the surrounding material slows this relativistic
  flow down. This model was confirmed recently with the discovery last Janu
 ary of the predicted prompt optical emission from GRB 990123. Unfortunatel
 y this model does not describe uniquely the origin of GRBs and it leaves s
 everal options possible. In this talk I describe the relativistic fireball
  model and its implications to the possible sources of GRBs and to other p
 henomena\, like Ultra High Energy Cosmic Rays and high-energy neutrinos th
 at might be associated with GRBs. Organiser(s): Luigi Di Lella/ EP Divisio
 nNote: Tea & coffee will be served at 16.00 hrs\n\nhttp://indico.cern.ch/c
 onferenceDisplay.py?confId=a032756
LOCATION:CERN Main Auditorium
URL:http://indico.cern.ch/conferenceDisplay.py?confId=a032756
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