Detection of TeV gamma rays from the BL Lacertae object IES 1959+650 with the Whipple 10 meter telescope

J. Holder, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Bucekly, D. A. Carter-Lewis, W. Cui, C. Dowdall, C. Duke, I. De La Calle Perez, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. Fortson, J. A. Gaidos, K. Gibbs, S. Gammell, J. Hall, T. A. HallA. M. Hillas, D. Horan, M. Jordan, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, S. LeBohec, E. T. Linton, J. Lloyd-Evans, P. Moriarty, D. Müller, T. N. Nagai, R. Ong, M. Page, R. Pallassini, D. Petry, B. Power-Mooney, J. Quinn, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, V. V. Vassiliev, S. P. Wakely

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68 Scopus citations


We present the first strong detection of very high energy γ-rays from the close (z = 0.048) X-ray-selected BL Lacertae object 1ES 1959-650. Observations were made with the Whipple 10 m telescope on Mount Hopkins, Arizona, using the atmospheric Cerenkov imaging technique. The flux between 2002 May and July was highly variable, with a mean of 0.64 7plusmn; 0.03 times the steady flux from the Crab Nebula and reaching a maximum of 5 crab, with variability on timescales as short as 7 hr.

Original languageEnglish (US)
Pages (from-to)L9-L12
JournalAstrophysical Journal
Issue number1 II
StatePublished - Jan 20 2003

Bibliographical note

Funding Information:
The VERITAS Collaboration is supported by the US Department of Energy, the NSF, the Smithsonian Institution, PPARC (UK), and Enterprise Ireland.


  • Gamma rays: observations


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