  Context. On March 4, 2013, the Fermi-LAT and AGILE reported a flare from the
direction of the Crab Nebula in which the high-energy (HE; E > 100 MeV) flux
was six times above its quiescent level. Simultaneous observations in other
energy bands give us hints about the emission processes during the flare
episode and the physics of pulsar wind nebulae in general. Aims. We search for
variability 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 Cherenkov
telescopes. Methods. Observational data taken with the H.E.S.S. instrument on
five consecutive days during the flare were analysed concerning the flux and
spectral shape of the emission from the Crab Nebula. Night-wise light curves
are presented with energy thresholds of 1 TeV and 5 TeV. Results. The
observations conducted with H.E.S.S. on 2013 March 6 to March 10 show no
significant changes in the flux. They limit the variation on the integral flux
above 1 TeV to less than 63% and the integral flux above 5 TeV to less than 78%
at a 95% confidence level.
