Synchrotron afterglows of very high energy gamma-ray bursts

seminar default logo
Ομιλητής :  
Δρ. Lauren Rhodes (Oxford University, Ηνωμένο Βασίλειο)
Αίθουσα :  
Αίθουσα Σεμιναρίων 2oυ & Online
Ημερομηνία :  

Ώρα : 

Περίληψη :

To date, six long gamma-ray bursts (GRBs) have been found to have very high energy (VHE, >100GeV) counterparts. Interestingly, more than one emission mechanism has been invoked to explain the VHE counterpart from different events. I have led observing campaigns to study radio afterglows of these fascinating events to investigate whether these VHE GRBs have unusual jet properties or environments.  The jet properties and environments of VHE GRBs vary hugely in a similar manner to that seen in the ‘regular’ long GRB population with evidence of bright reverse shock emission and multiple jet components. In this seminar, I will present an overview of the long GRB phenomena, the results of observing campaigns on VHE GRBs 190829A and 201216C and introduce the possibilities for studying VHE GRBs as a population of sources. Finally, I will briefly talk about the latest event: GRB 221009A one of the most energetic long GRBs today.