Furniss, A.
; Noda, K.
; Boggs, S.
; Chiang, J.
; Christensen, F.
; Craig, W.
; Giommi, P.
; Hailey, C.
; Harisson, F.
; Madejski, G.
; Nalewajko, K.
; Perri, M.
; Stern, D.
; Urry, M.
; Verrecchia, F.
; Zhang, W.
; Ahnen, M. L.
; Ansoldi, S.
; Antonelli, L. A.
; Antoranz, P.
; Babic, A.
; Banerjee, B.
; Bangale, P.
; de Almeida, U. Barres
; Barrio, J. A.
; Becerra Gonzalez, J.
; Bednarek, W.
; Bernardini, E.
; Biasuzzi, B.
; Biland, A.
; Blanch, O.
; Bonnefoy, S.
; Bonnoli, G.
; Borracci, F.
; Bretz, T.
; Carmona, E.
; Carosi, A.
; Chatterjee, A.
; Clavero, R.
; Colin, P.
; Colombo, E.
; Contreras, J. L.
; Cortina, J.
; Covino, S.
; Da Vela, P.
; Dazzi, F.
; De Angelis, A.
; De Caneva, G.
; De Lotto, B.
; de Ona Wilhelmi, E.
; Delgado Mendez, C.
; Di Pierro, F.
; Prester, Dijana Dominis
; Dorner, D.
; Doro, M.
; Einecke, S.
; Eisenacher Glawion, D.
; Elsaesser, D.
; Fernandez-Barral, A.
; Fidalgo, D.
; Fonseca, M. V.
; Font, L.
; Frantzen, K.
; Fruck, C.
; Galindo, D.
; Garcia Lopez, R. J.
; Garczarczyk, M.
; Garrido Terrats, D.
; Gaug, M.
; Giammaria, P.
; Godinovic, N.
; Gonzalez Munoz, A.
; Guberman, D.
; Hanabata, Y.
; Hayashida, M.
; Herrera, J.
; Hose, J.
; Hrupec, D.
; Hughes, G.
; Idec, W.
; Kellermann, H.
; Kodani, K.
; Konno, Y.
; Kubo, H.
; Kushida, J.
; La Barbera, A.
; Lelas, D.
; Lewandowska, N.
; Lindfors, E.
; Lombardi, S.
; Longo, F.
; Lopez, M.
; Lopez-Coto, R.
; Lopez-Oramas, A.
; Lorenz, E.
; Majumdar, P.
; Makariev, M.
; Mallot, K.
; Maneva, G.
; Manganaro, M.
; Mannheim, K.
; Maraschi, L.
; Marcote, B.
; Mariotti, M.
; Martinez, M.
; Mazin, D.
; Menzel, U.
; Miranda, J. M.
; Mirzoyan, R.
; Moralejo, A.
; Nakajima, D.
; Neustroev, V.
; Niedzwiecki, A.
; Nievas Rosillo, M.
; Nilsson, K.
; Nishijima, K.
; Orito, R.
; Overkemping, A.
; Paiano, S.
; Palacio, J.
; Palatiello, M.
; Paneque, D.
; Paoletti, R.
; Paredes, J. M.
; Paredes-Fortuny, X.
; Persic, M.
; Poutanen, J.
; Moroni, P. G. Prada
; Prandini, E.
; Puljak, I.
; Reinthal, R.
; Rhode, W.
; Ribo, M.
; Rico, J.
; Garcia, J. Rodriguez
; Saito, T.
; Saito, K.
; Satalecka, K.
; Scapin, V.
; Schultz, C.
; Schweizer, T.
; Shore, S. N.
; Sillanpaa, A.
; Sitarek, J.
; Snidaric, I.
; Sobczynska, D.
; Stamerra, A.
; Steinbring, T.
; Strzys, M.
; Takalo, L.
; Takami, H.
; Tavecchio, F.
; Temnikov, P.
; Terzic, T.
; Tescaro, D.
; Teshima, M.
; Thaele, J.
; Torres, D. F.
; Toyama, T.
; Treves, A.
; Verguilov, V.
; Vovk, I.
; Will, M.
; Zanin, R.
; Archer, A.
; Benbow, W.
; Bird, R.
; Biteau, J.
; Bugaev, V.
; Cardenzana, J. V.
; Cerruti, M.
; Chen, Xuhui
; Ciupik, L.
; Connolly, M. P.
; Cui, W.
; Dickinson, H. J.
; Dumm, J.
; Eisch, J. D.
; Falcone, A.
; Feng, Q.
; Finley, J. P.
; Fleischhack, H.
; Fortin, P.
; Fortson, L.
; Gerard, L.
; Gillanders, G. H.
; Griffin, S.
; Griffiths, S. T.
; Grube, J.
; Gyuk, G.
; Hakansson, Nils
; Holder, J.
; Humensky, T. B.
; Johnson, C. A.
; Kaaret, P.
; Kertzman, M.
; Kieda, D.
; Krause, M.
; Krennrich, F.
; Lang, M. J.
; Lin, T. T. Y.
; Maier, G.
; McArthur, S.
; McCann, A.
; Meagher, K.
; Moriarty, P.
; Mukherjee, R.
; Nieto, D.
; Ong, R. A.
; Park, N.
; Petry, D.
; Pohl, Martin
; Popkow, A.
; Ragan, K.
; Ratliff, G.
; Reyes, L. C.
; Reynolds, P. T.
; Richards, G. T.
; Roache, E.
; Santander, M.
; Sembroski, G. H.
; Shahinyan, K.
; Staszak, D.
; Telezhinsky, Igor
; Tucci, J. V.
; Tyler, J.
; Vassiliev, V. V.
; Wakely, S. P.
; Weiner, O. M.
; Weinstein, A.
; Wilhelm, Alina
; Williams, D. A.
; Zitzer, B.
; Vince, O.
; Fuhrmann, L.
; Angelakis, E.
; Karamanavis, V.
; Myserlis, I.
; Krichbaum, T. P.
; Zensus, J. A.
; Ungerechts, H.
; Sievers, A.
; Bachev, R.
; Boettcher, M.
; Chen, W. P.
; Damljanovic, G.
; Eswaraiah, C.
; Guver, T.
; Hovatta, T.
; Hughes, Z.
; Ibryamov, S. I.
; Joner, M. D.
; Jordan, B.
; Jorstad, S. G.
; Joshi, M.
; Kataoka, J.
; Kurtanidze, O. M.
; Kurtanidze, S. O.
; Lahteenmaki, A.
; Latev, G.
; Lin, H. C.
; Larionov, V. M.
; Mokrushina, A. A.
; Morozova, D. A.
; Nikolashvili, M. G.
; Raiteri, C. M.
; Ramakrishnan, V.
; Readhead, A. C. R.
; Sadun, A. C.
; Sigua, L. A.
; Semkov, E. H.
; Strigachev, A.
; Tammi, J.
; Tornikoski, M.
; Troitskaya, Y. V.
; Troitsky, I. S.
; Villata, M.
We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 2013 April 1 and August 10, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign, the nearby BL Lac object was observed in both a quiescent and an elevated state. The broadband campaign includes observations with NuSTAR, MAGIC, VERITAS, the Fermi Large Area Telescope, Swift X-ray Telescope and UV Optical Telescope, various ground-based optical instruments, including the GASP-WEBT program, as well as radio observations by OVRO, Metsahovi, and the F-Gamma consortium. Some of the MAGIC observations were affected by a sand layer from the Saharan desert, and had to be corrected using event-by-event corrections derived with a Light Detection and Ranging (LIDAR) facility. This is the first time that LIDAR information is used to produce a physics result with Cherenkov Telescope data taken during adverse atmospheric conditions, and hence sets a precedent for the current and future ground-based gamma-ray instruments. The NuSTAR instrument provides unprecedented sensitivity in hard X-rays, showing the source to display a spectral energy distribution (SED) between 3 and 79 keV consistent with a log-parabolic spectrum and hard X-ray variability on hour timescales. None (of the four extended NuSTAR observations) show evidence of the onset of inverse-Compton emission at hard X-ray energies. We apply a single-zone equilibrium synchrotron self-Compton (SSC) model to five simultaneous broadband SEDs. We find that the SSC model can reproduce the observed broadband states through a decrease in the magnetic field strength coinciding with an increase in the luminosity and hardness of the relativistic leptons responsible for the high-energy emission.
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