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Context. On March 4, 2013, the Fermi-LAT and AGILE reported a flare from thedirection of the Crab Nebula in which the high-energy (HE; E > 100 MeV) fluxwas six times above its quiescent level. Simultaneous observations in otherenergy bands give us hints about the emission processes during the flareepisode and the physics of pulsar wind nebulae in general. Aims. We search forvariability of the emission of the Crab Nebula at very-high energies (VHE; E >100 GeV), using contemporaneous data taken with the H.E.S.S. array of Cherenkovtelescopes. Methods. Observational data taken with the H.E.S.S. instrument onfive consecutive days during the flare were analysed concerning the flux andspectral shape of the emission from the Crab Nebula. Night-wise light curvesare presented with energy thresholds of 1 TeV and 5 TeV. Results. Theobservations conducted with H.E.S.S. on 2013 March 6 to March 10 show nosignificant changes in the flux. They limit the variation on the integral fluxabove 1 TeV to less than 63% and the integral flux above 5 TeV to less than 78%at a 95% confidence level.

H.E.S.S. Observations of the Crab during its March 2013 GeV Gamma-Ray Flare