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• W1532247943 abstract "<i>Aims. <i/>Very-high-energy (VHE; 100 GeV) <i>γ<i/>-rays are expected from <i>γ<i/>-ray bursts (GRBs) in some scenarios. Exploring this photon energy regime is necessary for understanding the energetics and properties of GRBs. <i>Methods. <i/>GRBs have been one of the prime targets for the HESS experiment, which makes use of four Imaging Atmospheric Cherenkov Telescopes (IACTs) to detect VHE <i>γ<i/>-rays. Dedicated observations of 32 GRB positions were made in the years 2003–2007 and a search for VHE <i>γ<i/>-ray counterparts of these GRBs was made. Depending on the visibility and observing conditions, the observations mostly start minutes to hours after the burst and typically last two hours.<i>Results. <i/>Results from observations of 22 GRB positions are presented. Evidence of a VHE signal was found neither in observations of any individual GRBs nor from stacking data from subsets of GRBs with higher expected VHE flux according to a model-independent ranking scheme. Upper limits for the VHE <i>γ<i/>-ray flux from the GRB positions were derived. For those GRBs with measured redshifts, differential upper limits at the energy threshold after correcting for absorption due to extra-galactic background light are also presented." @default.
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