Lecturer: Dr.Noemie Globus Affiliation: Racah Institute of Physics, The Hebrew University of Jerusalem Abstract: Could UHECRs originate from gamma-ray bursts? To explore that very question, we performed numerical calculations of UHECRs accelerated at GRB internal shocks, taking into account all the relevant energy loss mechanisms. For various choices of the GRB parameters, we calculated the spectrum of cosmic rays escaping from the GRB environment as well as secondary particles produced either during the acceleration or extragalactic propagation. I will discuss the assumptions under which the extragalactic GRB model is able to reproduce the UHECR data on the energy spectrum and composition, and show the consequences of this model on the interpretation of the Galactic-to-extragalactic cosmic ray transition. I will also discuss the impact of the Galactic and extragalactic magnetic fields on the expected anisotropy levels. Additional details of the upcoming Astrophysics' seminars can be found on the following link. ‏האירוע הזה כולל שיחת וידאו ב-Google Hangouts. הצטרף: https://hangouts.google.com/hangouts/_/mail.huji.ac.il/astrophysics?hceid=bWFpbC5odWppLmFjLmlsX2c0czhydDlpcmhwZzRvdGNybWIzZGFqcjdvQGdyb3VwLmNhbGVuZGFyLmdvb2dsZS5jb20.dq09gt6t2eaghuapoa9rj61co4&hs=121