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We report on simultaneous broadband observations of the TeV-emitting blazarMarkarian 501 between 1 April and 10 August 2013, including the first detailedcharacterization of the synchrotron peak with Swift and NuSTAR. During thecampaign, the nearby BL Lac object was observed in both a quiescent and anelevated state. The broadband campaign includes observations with NuSTAR,MAGIC, VERITAS, the Fermi Large Area Telescope (LAT), Swift X-ray Telescope andUV Optical Telescope, various ground-based optical instruments, including theGASP-WEBT program, as well as radio observations by OVRO, Mets\"ahovi and theF-Gamma consortium. Some of the MAGIC observations were affected by a sandlayer from the Saharan desert, and had to be corrected using event-by-eventcorrections derived with a LIDAR (LIght Detection And Ranging) facility. Thisis the first time that LIDAR information is used to produce a physics resultwith Cherenkov Telescope data taken during adverse atmospheric conditions, andhence sets a precedent for the current and future ground-based gamma-rayinstruments. The NuSTAR instrument provides unprecedented sensitivity in hardX-rays, showing the source to display a spectral energy distribution between 3and 79 keV consistent with a log-parabolic spectrum and hard X-ray variabilityon hour timescales. None (of the four extended NuSTAR observations) showsevidence of the onset of inverse-Compton emission at hard X-ray energies. Weapply a single-zone equilibrium synchrotron self-Compton model to fivesimultaneous broadband spectral energy distributions. We find that thesynchrotron self-Compton model can reproduce the observed broadband statesthrough a decrease in the magnetic field strength coinciding with an increasein the luminosity and hardness of the relativistic leptons responsible for thehigh-energy emission.

First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign