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In the current view of Gamma-Ray Burst (GRB) phenomena, an emission componentextending up to the very-high energy (VHE, E > 30 GeV) domain is though to be arelatively common feature at least in the brightest events. This leads to anunexpected richness of possible theoretical models able to describe suchphenomenology. Hints of emission at tens of GeV are indeed known since theEGRET observations during the '90s and confirmed in the Fermi-LAT data.However, our comprehension of these phenomena is still far to be satisfactory.In this respect, the VHE characterization of GRBs may constitute a breakthroughfor understanding their physics and, possibly, for providing decisive clues forthe discrimination among different proposed emission mechanisms, which arebarely distinguishable at lower energies. The current generation of Cherenkovobservatories, such as the MAGIC telescopes, have opened the possibility toextend the measurement of GRB emission, and in general to any short time-scaletransient phenomena, fromfew tens of GeV up to the TeV energy range, with ahigher sensitivity with respect to gamma-ray space-based instruments. In thenear future, a crucial role for the VHE observations of GRBs will be played bythe Cherenkov Telescope Array (CTA), thanks to its about one order of magnitudebetter sensitivity and lower energy threshold with respect to currentinstruments. In this contribution, we present a method aimed at providing VHEdetection prospects for observations of GRB-like transient events withCherenkov telescopes. In particular, we consider the observation of thetransient event GRB 090102 as a test case for the method and show the achieveddetection prospects under different observational conditions for the MAGICtelescopes and CTA.

Detection prospects for short time-scale transient events at VHE with current and next generation Cherenkov observatories