Monitoring Gamma-Ray Burst VHE emission with the Southern Wide-field-of-view Gamma-ray Observatory

Discussion timeslot (ZOOM-Meeting): 21. July 2021 - 12:00
ZOOM-Meeting URL: https://desy.zoom.us/j/98542982538
ZOOM-Meeting ID: 98542982538
ZOOM-Meeting Passcode: ICRC2021
Corresponding Session: https://icrc2021-venue.desy.de/channel/54-Gamma-Ray-Bursts-in-the-VHE-regime-GAI/94
Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-04/5

Abstract:
'It has been established that Gamma-Ray Bursts (GRB) can produce Very High Energy radiation (VHE, E larger 100 GeV), opening a new window on the investigation of particle acceleration and radiation properties in the most energetic domain. We expect that next-generation instruments, such as the Cherenkov Telescope Array (CTA), will mark a huge improvement in their observation. However, constraints on the target visibility and the limited duty cycle of Imaging Atmospheric Cherenkov Telescopes (IACT), limit their ability to react promptly to transient events and to characterize them as a population. Here we use a grid of instrument performance estimates, based on the Extensive Air Shower (EAS) array concept proposed by the Southern Wide Field-of-view Gamma-ray Observatory (SWGO) Collaboration, to evaluate the possibility to detect and track VHE emission from GRBs. Observations by the Fermi Large Area Telescope (Fermi-LAT) at high energy (HE, E larger 10 GeV), identified some events with a distinct spectral component, which can represent a substantial fraction of the emitted energy and even arise in early stages of the process. Using models based on these properties, we estimate the possibilities that a wide field of view and large effective area ground-based monitoring facility has to probe VHE emission from GRBs. We show that the ability to monitor VHE transients with a nearly continuous scanning of the sky grants an opportunity to access simultaneous electromagnetic counterparts to gravitational waves and relativistic particles sources up to cosmological scales, in a way that is not available to IACTs.'

Authors: Giovanni La Mura | Ulisses Barres de Almeida | Ruben Conceição | Alessandro De Angelis | Francesco Longo | Mário Pimenta | Elisa Prandini | Edna Loredana Ruiz Velasco
Collaboration: SWGO

Indico-ID: 356
Proceeding URL: https://pos.sissa.it/395/709