报告摘要：Very high energy (VHE, > 100 GeV) gamma-ray emission from Gamma Ray Bursts (GRBs) has long been predicted but was first detected in recent years by the ground-based air-Cherenkov telescopes H.E.S.S. and MAGIC. While the sample of GRBs detected in VHE gamma-rays is still very small, it is already posing interesting questions and challenges to theoretical models, especially after detection of GRB 221009A, the brightest GRB ever detected, by the Large High Altitude Air Shower Observatory (LHAASO) with gamma-ray energy exceeding 10 TeV. Detection of VHE emission from GRBs hasimplications for the particle acceleration and emission mechanism, properties of the jet and environment surrounding the GRB, intergalactic media, as well as for fundamental physics. In this talk we will focus on these topics, progress made to date towards understanding them and what remain to be done.
主讲人简介：Prof. Razzaque earned his BSc in Physics in 1994 and MSc in Physics in 1996 (both from the University of Dhaka, Bangladesh), and Diploma in High Energy Physics from the International Centre for Theoretical Physics in Trieste, Italy, in 1997. Following the completion of his PhD in Physics from the University of Kansas, Lawrence, USA (2002), Professor Razzaque carried out postdoctoral research at Penn State University. He won the prestigious National Research Council Research Associateship of the National Academy of Sciences (USA) and conducted research in the US Naval Research Laboratory in Washington, DC. Prior to joining the University of Johannesburg in 2013, he served as a Research Associate Professor at George Mason University in Virginia (USA). Until now, Prof. Razzaque has authored over 90 theory papers (with total publications over 200). He is a member of the Large Area Telescope (LAT) Collaboration of NASA’s Fermi Gamma-ray Space Telescope, of the next generation ground-based gamma-ray observatory (the Cherenkov Telescope Array or CTA) consortium, and of the KM3NeT neutrino observatory currently under construction in the Mediterranean Sea.
