Search for TeV Gamma-ray Emission from GRB 100621A, an extremely bright GRB in X-rays, with H.E.S.S. - Abramowski, Attila; Wagner, Stefan; Zacharias, Michael; Becherini, Yvonne; Behera, Bagmeet; Cologna, Gabriele; Jankowsky, Felix; Kaufmann, Sarah; Mohamed, Mahmoud; Quirrenbach, Andreas; Schwemmer, Stephanie (Astronomy and astrophysics, 2014)