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dc.contributor.authorAharonian, F.en_US
dc.contributor.authorBüsching, I.en_US
dc.contributor.authorDe Jager, O.C.en_US
dc.contributor.authorHolleran, M.en_US
dc.contributor.authorRaubenheimer, B.C.en_US
dc.contributor.authorVenter, C.
dc.contributor.authorH.E.S.S. Collaboration
dc.date.accessioned2010-08-04T15:37:35Z
dc.date.available2010-08-04T15:37:35Z
dc.date.issued2009en_US
dc.identifier.citationAharonian, F. et al. 2009. HESS observations of y-ray bursts in 2003-2007. Astronomy and astrophysics, 495(2):505-512, Feb. [http://www.aanda.org/]en_US
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/3494
dc.identifier.urihttps://doi.org/10.1051/0004-6361:200811072
dc.identifier.urihttps://www.aanda.org/articles/aa/abs/2009/08/aa11072-08/aa11072-08.html
dc.description.abstractAims. Very-high-energy (VHE; $\ga$100 GeV) $\gamma $-rays are expected from $\gamma $-ray bursts (GRBs) in some scenarios. Exploring this photon energy regime is necessary for understanding the energetics and properties of GRBs. Methods. 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 $\gamma $-rays. Dedicated observations of 32 GRB positions were made in the years 2003-2007 and a search for VHE $\gamma $-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. Results. 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 $\gamma $-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
dc.publisherEDP Sciences
dc.subjectgamma rays: bursts
dc.subjectgamma rays: observations
dc.titleHESS observations of y-ray bursts in 2003-2007en_US
dc.contributor.researchID10859748 - Holleran, Mathew
dc.contributor.researchID12006653 - Venter, Christo
dc.contributor.researchID10179240 - Raubenheimer, Barend Christoffel
dc.contributor.researchID13235176 - Büsching, Ingo
dc.contributor.researchID10065857 - De Jager, Ocker Cornelis


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