Apr 12 – 17, 2021
Africa/Johannesburg timezone

GRB 160625B: Evidence for a Gaussian-Shaped Jet

Apr 14, 2021, 6:45 PM
Contributed Gamma-ray Bursts Exploring the Cosmos: GRB-1


Virginia Cunningham


Gamma-ray bursts (GRBs) detected by the Large Area Telescope (LAT) on board Fermi tend to be extraordinarily bright, making them ideal candidates for exploring emission models beyond the traditional on-axis, top-hat jet model. In this talk I will discuss our recent work modeling GRB 160625B with alternative jet structure shapes and testing assumptions typically made regarding certain physical parameters of the burst (e.g., burst energy, circumburst density, and participation fraction of electrons). We find that GRB 160625B does in fact prefer a more complex jet structure similar to that of the short GRB 170817A, implying jet structure is not dependent on progenitor type but is rather a more universal physical process. We also present evidence to suggest that GRB 160625B may show a preference for a black hole collapsar origin as opposed to a magnetar origin. Finally, I will share some preliminary results found from our initial modeling of a larger population study of Fermi GRBs.

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