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Dedicated observations have been performed with the H.E.S.S. telescopes, leading to a detection at the $5.5\\,\\sigma$ significance level. The measured flux above 310 GeV is $(8.3 \\pm 1.7_{\\rm{stat}}\\pm 1.7_{\\rm{sys}})\\times 10^{-13}$ photons \\cms\\ (about 0.6% of that of the Crab Nebula), and the power law spectrum","authors_text":"A.A. Zdziarski, A. Balzer, A. Barnacka, A. Cheesebrough, A. Djannati-Ata\\\"i, A. Fiasson, A. F\\\"orster, A.G. Akhperjanian, A. Hillert, A. Jacholkowska, A. Lopatin, A. Marcowith, A. Quirrenbach, A. Reimer, A. Santangelo, A. Schulz, A. Szostek, A. Viana, A. Wierzcholska, A. W\\\"ornlein, A. Zajczyk, A. Zech, B. Degrange, B. Giebels, B. Kh\\'elifi, B. Opitz, B. Peyaud, B. Rudak, C. Boisson, C.B. Rulten, C.-C. Lu, C. Couturier, C. Deil, C. Farnier, C. Jahn, C.L. Naumann, C. Stegmann, C. Trichard, C. van Eldik, C. Venter, D.A. Sanchez, D. Fernandez, D. G\\\"oring, D. Horns, D. Klochkov, D. Kolitzus, D. Lennarz, D. Nedbal, D. Wouters, E. Ang\\\"uner, E. Birsin, E. Bissaldi, E. de O\\~na Wilhelmi, E. Moulin, F. Acero, F. Aharonian, F. Brun, F. Feinstein, F. Jankowsky, F. Krayzel, F. Rieger, F. Sch\\\"ussler, F. Spie{\\ss}, F. Stinzing, F. Volpe, G. Anton, G. Cologna, G. Dubus, G. Fontaine, G. Heinzelmann, G. Henri, G. Hermann, G. Lamanna, G. Maurin, G. Pelletier, G. P\\\"uhlhofer, G. Rowell, G. Spengler, G. Vasileiadis, H.E.S.S. Collaboration: A. Abramowski, H. Gast, H.J. Dickinson, H.J. V\\\"olk, H. Laffon, H. Poon, H. Sol, H.-S. Zechlin, I.D. Davids, I. Jung, I. Oya, I. Sushch, J.A. Hinton, J. Becker Tjus, J. Biteau, J. Bolmont, J. Brucker, J. Conrad, J.D. Hague, J. Dyks, J.F. Glicenstein, J. Hahn, J. Harris, J. Lefaucheur, J. M\\'ehault, J. Niemiec, J. Perez, J.-P. Lenain, J.-P. Tavernet, K. Bernl\\\"ohr, K. Dutson, K. Egberts, K. Katarzy\\'nski, K. Kosack, K. Stycz, K. Valerius, L. Oakes, L.O'C. Drury, L. Rob, \\L. Stawarz, M.A. Kastendieck, M. Cerruti, M. Chr\\'etien, M.C. Medina, M. Dalton, M. de Naurois, M. Dyrda, M. F\\\"u{\\ss}ling, M. Gajdus, M. Grudzi\\'nska, M.-H. Grondin, M. Holler, M. Jamrozy, M. Janiak, M.K. Daniel, M. Kieffer, M. Lemoine-Goumard, M. Mayer, M. Meyer, M. Mohamed, M. Ostrowski, M. Panter, M. Paz Arribas, M. Punch, M. Raue, M. Renaud, M. Tluczykont, M.V. Fernandes, M. Vorster, M. Ward, M. Weidinger, M. Zacharias, N. Maxted, Nu. Komin, N.W. Pekeur, O. Hervet, O. Reimer, P. Bordas, P. Brun, P. deWilt, P. Eger, P. Espigat, P. Hofverberg, P.M. Chadwick, P.-O. Petrucci, P.P. Kr\\\"uger, P. Vincent, P. Wagner, P. Willmann, R.C.G. Chaves, R. Chalme-Calvet, R. de los Reyes, R.D. Parsons, R. Moderski, R. Schlickeiser, R. Steenkamp, R. Terrier, R. White, S. Balenderan, S. Carrigan, S. Casanova, S. Colafrancesco, S. Fegan, S. H\\\"affner, S.J. Nolan, S.J. Wagner, S. Kaufmann, S. Klepser, S. Krakau, S. Ohm, S. Pita, S. Raab, S. Rosier-Lees, S. Schwarzburg, S. Schwemmer, T. Bulik, T. Edwards, T. Garrigoux, T.J.L. McComb, T. Kneiske, T. Lohse, T. Murach, U. Katz, U. Menzler, U. Schwanke, V. Marandon, V. Sahakian, W. Domainko, W. Hofmann, W. Klu\\'zniak, Y.A. Gallant, Y. 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