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[Abridged] Context. To construct and interpret the spectral energydistribution (SED) of BL Lacertae objects, simultaneous broad-band observationsare mandatory. Aims. We present the results of a dedicated multi-wavelengthstudy of the high-frequency peaked BL Lacertae (HBL) object and known TeVemitter 1ES 2344+514 by means of a pre-organised campaign. Methods. Theobservations were conducted during simultaneous visibility windows of MAGIC andAGILE in late 2008. The measurements were complemented by Mets\"ahovi,RATAN-600, KVA+Tuorla, Swift and VLBA pointings. Additional coverage wasprovided by the ongoing long-term F-GAMMA and MOJAVE programs, the OVRO 40-mand CrAO telescopes as well as the Fermi satellite. The obtained SEDs aremodelled using a one-zone as well as a self-consistent two-zone synchrotronself-Compton model. Results. 1ES 2344+514 was found at very low flux states inboth X-rays and very high energy gamma rays. Variability was detected in thelow frequency radio and X-ray bands only, where for the latter a small flarewas observed. The X-ray flare was possibly caused by shock accelerationcharacterised by similar cooling and acceleration time scales. MOJAVE VLBAmonitoring reveals a static jet whose components are stable over time scales ofeleven years, contrary to previous findings. There appears to be no significantcorrelation between the 15 GHz and R-band monitoring light curves. Theobservations presented here constitute the first multi-wavelength campaign on1ES 2344+514 from radio to VHE energies and one of the few simultaneous SEDsduring low activity states. The quasi-simultaneous Fermi-LAT data poses somechallenges for SED modelling, but in general the SEDs are described well byboth applied models. The resulting parameters are typical for TeV emittingHBLs. Consequently it remains unclear whether a so-called quiescent state wasfound in this campaign.

The Simultaneous Low State Spectral Energy Distribution of 1ES 2344+514 from Radio to Very High Energies