2021/08/02 by G. La Mura, La Mura, G.
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #Gamma-ray bursts and supernovae #High Energy Astrophysical Phenomena (astro-ph.HE) #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Particle Detector Development and Performance
paper · pdf · doi:10.48550/arxiv.2108.00761
openalex publication_date 2021/08/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
It has been established that Gamma-Ray Bursts (GRB) can produce Very High\nEnergy radiation (E > 100 GeV), opening a new window on the investigation of\nparticle acceleration and radiation properties in the most energetic domain. We\nexpect that next-generation instruments, such as the Cherenkov Telescope Array\n(CTA), will mark a huge improvement in their observation. However, constraints\non the target visibility and the limited duty cycle of Imaging Atmospheric\nCherenkov Telescopes (IACT) reduce their ability to react promptly to transient\nevents and to characterise their general properties. Here we show that an\ninstrument based on the Extensive Air Shower (EAS) array concept, proposed by\nthe Southern Wide Field-of-view Gamma-ray Observatory (SWGO) Collaboration, has\npromising possibilities to detect and track VHE emission from GRBs.\nObservations made by the Fermi Large Area Telescope (Fermi-LAT) identified some\nevents with a distinct spectral component, extending above 1 ,GeV or even\n10 ,GeV, which can represent a substantial fraction of the emitted energy and\nalso arise in early stages of the process. Using models based on these\nproperties, we estimate the possibilities that a wide field of view and large\neffective area ground-based monitoring facility has to probe VHE emission from\nGRBs. We show that the ability to monitor VHE transients with a nearly\ncontinuous scanning of the sky grants an opportunity to access simultaneous\nelectromagnetic counterparts to Multi-Messenger triggers up to cosmological\nscales, in a way that is not available to IACTs.\n