Simultaneous Broadband Observations of Mrk 501 with NuSTAR

We report on the multiwavelength campaign on Mrk 501 between May and August of 2013. NuSTAR hard X-ray observations of the very-high-enery gamma-ray blazar are supplemented with simultaneous Swift, Fermi Large Area Telescope, MAGIC and VERITAS exposures, allowing an unprecedented view of the broadband spectral energy distribution. Broadband light curves including radio and optical observations will be presented. NUSTAR observations, triggered by an elevated gamma-ray state detected with the MAGIC imaging atmospheric Cerenkov telescope, provide a detailed comparison between relatively low and high simultaneous spectral energy distributions of the source. Spectral variability observed with NuSTAR between the low and elevated states in the wide 3-70 keV band will be presented and used to extract information about the relativistic particle population and emission mechanism at work within the jet.