Up to now, nearly all the detected extragalactic VHE gamma-ray sources belong to the class of high-frequency peaked BL Lac objects (HBL), which show a pronounced peak in the hard X-ray band. All detected VHE sources show a comparable luminosity at TeV energies. MAGIC has started a systematic scan on X-ray bright HBL objects in the northern sky during its cycle1 observations from January 2005 to March 2006. Following the blazar compilation by Donato et al. (2001), 13 HBLs were selected with the criteria of low redshift (< 0.3), high X-ray flux (F(1keV) > 2uJy) and visibility under small zenith distances (< 30deg at culmination, leading to sources with a declination between -2 and +58). In that campaign 1ES 1218+30.4 was discovered and 1ES 2344+51.4 was detected in a low flux state with high significance. For another 10 sources upper limits on the integral flux above ~200GeV will be presented at the conference.

MAGIC

Proceedings of the 30th International Cosmic Ray Conference; Rogelio Caballero, Juan Carlos D'Olivo, Gustavo Medina-Tanco, Lukas Nellen, Federico A. Sánchez, José F. Valdés-Galicia (eds.); Universidad Nacional Autónoma de México, Mexico City, Mexico, 2008; Vol. 3 (OG part 2), pages 969-972