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Many theoretical works have predicted the existence of very high energy ($rm VHE:>100 GeV$) $gamma$-ray emission from Gamma-Ray Bursts (GRBs) in both the prompt and the afterglow phases. Observation of such high energy emission, especially in the prompt phase will provide critical information for us to understand the nature of mechanisms of radiation and jet, Lorentz invariance violation, relativistic bulk motion, and so on. Years of effort in observing afterglow phase emission has finally borne fruit recently, yet the prompt phases detection has eluded current instruments thus far. A wide field-of-view (FoV) and large effective area below to tens of GeV are essential to detect VHE emissions from GRBs in the prompt phase. The High Altitude Detection of Astronomical Radiation (HADAR) experiment, a wide FoV atmospheric Cherenkov telescope array, has these virtues. We here report on the estimates of its annual GRB detection rate. According to the experiments performance, our calculations are based on a phenomenological model to generate the pseudo-GRB population to obtain the number of signals from GRBs and backgrounds, at last, give the detection rate. Results indicate that detection rate of GRB for HADAR experiment is about 3 per year, which slightly changes with characteristics of the VHE extra components of the modeled GRB population. Moveover, the sensitivity of event fluence of GRBs at different distances is given.
The synchrotron self-Compton (SSC) emission from Gamma-ray Burst (GRB) forward shock can extend to the very-high-energy (VHE; $E_gamma > $100 GeV) range. Such high energy photons are rare and are attenuated by the cosmic infrared background before re
Gamma-ray bursts (GRBs) have been an enigma since their discovery forty years ago. However, considerable progress unraveling their mysteries has been made in recent years. Developments in observations, theory, and instrumentation have prepared the wa
We present high cadence multi-frequency radio observations of the long Gamma-Ray Burst (GRB) 190829A, which was detected at photon energies above 100 GeV by the High Energy Stereoscopic System (H.E.S.S.). Observations with the Meer Karoo Array Telesc
The number of Gamma-Ray Bursts (GRBs) detected at high energies ($sim,0.1-100$ GeV) has seen a rapid increase over the last decade, thanks to observations from the Fermi-Large Area Telescope. The improved statistics and quality of data resulted in a
The energetic pulsar PSR B1706-44 and the adjacent supernova remnant (SNR) candidate G 343.1-2.3 were observed by H.E.S.S. during a dedicated observational campaign in 2007. A new source of very-high-energy (VHE; E > 100 GeV) gamma-ray emission, HESS