Probing Gamma-Ray Burst VHE Emission with the Southern Wide-Field-of-View Gamma-Ray Observatory

Galaxies

Ulisses Barres de Almeida¹  Alessandro De Angelis²  Francesco Longo³  Davide Miceli⁴  Giovanni La Mura⁵  Ruben Conceição⁵  Bernardo Tomé⁵  Mário Pimenta⁵ 

[1] Brazilian Center for Physics Research (CBPF), Rua Dr. Xavier Sigaud 150, Rio de Janeiro 22290-180, Brazil;Dipartimento di Fisica e Astronomia—Università di Padova, Via Marzolo 8, 35131 Padova, Italy;IFPU—Institute for Fundamental Physics of the Universe, Via Beirut 2, 34014 Trieste, Italy;Laboratoire d’Annecy de Physique des Particules (LAPP), CNRS-IN2P3, 9 Chemin de Bellevue—BP 110, 74941 Annecy, France;Laboratório de Instrumentação e Física Experimental de Partículas (LIP), Av. Prof. Gama Pinto 2, 1649-003 Lisboa, Portugal;

关键词: instrumentation—detectors;    gamma rays: general;    gamma-ray bursts: general;   

DOI  :  10.3390/galaxies9040098

来源: DOAJ

【 摘 要 】

Recent observations have confirmed that Gamma-Ray Burst (GRB) afterglows produce Very High-Energy radiation (VHE, $E>100$GeV). This highly anticipated discovery opens new scenarios in the interpretation of GRBs and in their role as probes of Extragalactic Background Light (EBL) and Lorentz Invariance Violation (LIV). However, some fundamental questions about the actual nature of VHE emission in GRBs and its evolution during the burst are still unsolved. These questions will be difficult to address, even with future imaging Cherenkov telescopes, such as the Cherenkov Telescope Array (CTA). Here we investigate the prospects of gamma-ray sky monitoring with Extensive Air Showers arrays (EAS) to address these problems. We discuss the theoretical aspects connected with VHE radiation emission and the implications that its temporal evolution properties have on the interpretation of GRBs. By revisiting the high-energy properties of some Fermi-LAT detected GRBs, we estimate the typical fluxes expected in the VHE band and compare them with a range of foreseeable instrument performances, based on the Southern Wide Field-of-view Gamma-ray Observatory concept (SWGO). We focus our analysis on how different instrument capabilities affect the chances to explore the burst onset and early evolution in VHE, providing invaluable complementary information with respect to Cherenkov telescope observations. We show that under the assumption of conditions already observed in historical events, the next-generation ground monitoring detectors can actually contribute to answer several key questions.

【 授权许可】

Unknown