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The recent observations of photons with energies in the $10^{15}$ eV range further motivate searches for even higher-energy photons. In this paper, we present a search for photons with energies exceeding $2{\\times}10^{17}$ eV using about 5.5 years of hybrid data from the low-energy extensions of the Pierre Auger Observatory. The upper limits on the integral photon flux derived here are the most stringent one","authors_text":"A. Almela, A.A. Watson, A. Bakalova, A. Balaceanu, A. Bueno, A. Castellina, A.C. Cobos Cerutti, A.C. Fauth, A. Coleman, A. Condorelli, A.C. Rovero, A. Del Popolo, A. Di Matteo, A.D. Supanitsky, A. Etchegoyen, A. Filip\\v{c}i\\v{c}, A. Fuster, A. Gherghel-Lascu, A.G. Mariazzi, A. Gorgi, A. Haungs, A. Insolia, A. K\\\"a\\\"ap\\\"a, A. Khakurdikar, A. Letessier-Selvon, A.L. Garcia Vegas, A.L. M\\\"uller, A. Machado Payeras, A.M. Badescu, A.M. Botti, A. Menshikov, A. Nasr-Esfahani, A Nucita, A. Parra, A. Puyleart, A. Saftoiu, A. Segreto, A. Streich, A. Tapia, A. 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Schr\\\"oder, F. Guarino, F. Knapp, F.L. Briechle, F.M. Mariani, F. Montanet, F. Riehn, F. Salamida, F. S\\'anchez, F. Sarazin, F. Schl\\\"uter, G.A. Anastasi, G. Avila, G. Bhatta, G. Cataldi, G.C. Hill, G. Consolati, G. Farrar, G. Golup, G. Mancarella, G. Marsella, G. Matthiae, G. Medina-Tanco, G. Nicora, G. Parente, G.P. Guedes, G. Salina, G. Sigl, G. Silli, H. Asorey, H. Falcke, H. Gemmeke, H.J. Mathes, H.O. Klages, H. Salazar, H. Schieler, H. Schoorlemmer, H. Wahlberg, H. Wilczy\\'nski, I. Allekotte, I. Caracas, I.C. Mari\\c{s}, I. De Mitri, I.D. Vergara Quispe, I. Epicoco, I. Goos, I. Lhenry-Yvon, I. Norwood, J.A. Bellido, J.A. Chinellato, J.A. Day, J.A. Johnsen, J. Alvarez-Mu\\~niz, J. Ammerman Yebra, J. Biteau, J. Blazek, J. Bl\\\"umer, J. Brack, J. C. Arteaga Vel\\'azquez, J.C. D'Olivo, J. Chudoba, J. de Jes\\'us, J. de Oliveira, J.D. Sanabria Gomez, J. Ebr, J. Farmer, J.F. Soriano, J.F. Vald\\'es Galicia, J. Glombitza, J. Jurysek, J. Kleinfeller, J.M. Albury, J. Manshanden, J. Matthews, J.M. Figueira, J.M. Gonz\\'alez, J. Pallotta, J. Pawlowsky, J. Pe\\~na-Rodriguez, J. Perez Armand, J.P. Gongora, J. P\\k{e}kala, J.P. Lundquist, J. Rautenberg, J.R. H\\\"orandel, J. Ridky, J. Rodriguez Rojo, J.R.T. de Mello Neto, J. Schulte, J. Stasielak, J. Vicha, J. Vink, K. Almeida Cheminant, K. Bismark, K. Daumiller, K.H. Kampert, K. Mulrey, K.S. Caballero-Mora, L. Anchordoqui, L.A. N\\'u\\~nez, L. Bonneau Arbeletche, L. Caccianiga, L. Cazon, L. Chytka, L. Deval, L. Lopes, L. Lu, L.M. Domingues Mendes, L. Miramonti, L. Morejon, L. Nellen, L. No\\v{z}ka, L. Perrone, L. Vaclavek, L. Valore, L. Wiencke, L. Zehrer, M. Aglietta, M.A. Leigui de Oliveira, M.A. Muller, M. Boh\\'a\\v{c}ov\\'a, M. Buscemi, M. B\\\"usken, M. Cerda, M. del R\\'io, M. Dobre, M.E. Bertaina, M. Erdmann, M. Giammarchi, M. G\\'omez Berisso, M. Gottowik, M. Hrabovsk\\'y, M.I. Micheletti, M.J. Roncoroni, M. Kleifges, M. Mastrodicasa, M. Mostaf\\'a, M. Muzio, M. Niculescu-Oglinzanu, M. Niechciol, M. Palatka, M. Pech, M. Pimenta, M. Platino, M. Pothast, M. Prouza, M.R. Coluccia, M. Reininghaus, M.R. Hampel, M. Risse, M. Roth, M. Saharan, M. Schimassek, M. Schimp, M. Scornavacche, M. Stadelmaier, M. Su\\'arez-Dur\\'an, M.T. Dova, M. Tueros, M. Unger, M. Vacula, M. Zavrtanik, N. Borodai, N. Fazzini, N. Gonz\\'alez, N. Kunka, N. Langner, O. Deligny, O. Mart\\'inez Bravo, O. Scholten, O. Sima, O. Tkachenko, O. Zapparrata, P. Assis, P. Buchholz, P.F. G\\'omez Vitale, P.G. Brichetto Orchera, P.G. Isar, P. Hamal, P. Hansen, P. Horvath, P. Janecek, P.L. Biermann, P.L. Ghia, P. Mantsch, P.O. Mazur, P. Papenbreer, P. Privitera, P.R. Ara\\'ujo Ferreira, P. Ruehl, P. Savina, P. Schov\\'anek, P. Sommers, P. Stassi, P. Tobiska, P. Travnicek, Q. Luce, R. Alves Batista, R. Caruso, R.C. dos Anjos, R. Colalillo, R. Concei\\c{c}\\~ao, R.C. Shellard, R. Engel, R. L\\'opez, R.M. de Almeida, R. Mussa, R. Pelayo, R. Sarmento, R. Sato, R. Smau, R. Squartini, R. Ulrich, R. \\v{S}m\\'ida, R.W. Clay, S. Andringa, S. Buitink, S. Dasso, S. Hahn, S.J. De Jong, S.J. Sciutto, S. Marafico, S. Martinelli, S. Mayotte, S. Michal, S. Mollerach, S. Petrera, S. Querchfeld, S. Rossoni, S. Sehgal, S. Stani\\v{c}, S. Vorobiov, T. Bister, T. Bretz, T.D. Grubb, T. Fitoussi, T. Fodran, T. Fujii, T. Hebbeker, The Pierre Auger Collaboration: P. Abreu, T. Huege, T. Pierog, T. Schulz, T. Sudholz, T. Suomij\\\"arvi, U. Giaccari, V. Binet, V. de Souza, V. Lenok, V.M. Harvey, V. Novotny, V. Pirronello, V. Rizi, V. Scherini, V. Verzi, V.V. Kizakke Covilakam, W.M. Namasaka, W. Rodrigues de Carvalho, Z. Szadkowski, Z. 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