Very high-energy observations of the two high-frequency peaked BL Lac   objects 1ES 1218+304 and H 1426+428
  We present results of very-high-energy gamma-ray observations (E > 160 GeV) of two high-frequency-peaked BL Lac (HBL) objects, 1ES 1218+304 and H 1426+428, with the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE). Both sources are very-high-energy gamma-ray emitters above 100 GeV, detected using ground-based Cherenkov telescopes. STACEE observations of 1ES 1218+304 and H 1426+428 did not produce detections; we present 99% CL flux upper limits for both sources, assuming spectral indices measured mostly at higher energies. 
C. Mueller, N. Akhter, J. Ball, D.A. Bramel, J. Carson, C.E. Covault,   D. Driscoll, P. Fortin, D.M. Gingrich, D.S. Hanna, A...
astro-ph.HE hep-ex