2-6 September 2024
CJD Bonn Castell
Europe/Berlin timezone
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Contribution

CJD Bonn Castell

Constraining the structure and the dynamics of Gamma-Ray Bursts with VLBI

Speakers

  • Stefano GIARRATANA

Primary authors

Co-authors

Content

The very long baseline interferometry (VLBI) technique offers unique insights into the structure and dynamics of Gamma-Ray Bursts (GRBs). Specifically, VLBI serves as a fundamental tool for measuring the apparent superluminal expansion (if the GRB is seen on-axis) and proper motion (if the GRB is observed slightly off-axis) of the GRB outflow, enabling constraints on its geometry and characterisation of the circum-burst medium. This complementary information already proved to be crucial in alleviating, or even breaking, the degeneracy in the modelling. In this talk, I will focus on the results from two recent bursts, GRB201015A and GRB221009A. For the former, interferometric observations played a critical role in characterising the density profile of the circum-burst medium, while VLBI observations of GRB221009A, the brightest GRB ever recorded to date, enabled us to measure the size and the expansion of the outflow. Lastly, I will discuss future prospects of radio interferometry in GRB research.