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Discovery of VHE Gamma-Ray Emission from the Fermi-LAT Source 1ES 0502+675

ATEL # 2301; Rene A. Ong (UCLA) for the VERITAS Collaboration
on 17 Nov 2009; 20:19 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Rene Ong (

Subjects: Gamma Ray, >GeV, Request for Observations, AGN

The VERITAS Collaboration reports the discovery of very high energy (VHE; E>100 GeV) gamma-ray emission from the high-frequency-peaked BL Lac object 1ES 0502+675. The redshift is z = 0.341 (E. Perlman, private communication, 2009), which makes this the most distant BL Lac with a secure redshift detected at VHE. This new VHE source was observed with the VERITAS atmospheric-Cherenkov telescope array at relatively low elevation angles for ~13 hours of good-quality live time between 23 September 2009 and 16 November 2009 (UT). The observations were motivated by the flux and spectrum reported in the Fermi-LAT Bright Source List for 0FGL J0507.9+6739 (Abdo et al. 2009, ApJS 183, 46; Abdo et al. 2009, ApJ 700, 597). Analysis of the VERITAS data yields a detection of ~250 gamma rays from 1ES 0502+675, corresponding to a statistical significance of more than 6 standard deviations. The VHE flux is ~4% percent of the Crab above 350 GeV. VERITAS will continue to observe 1ES 0502+675 and contemporaneous multi-wavelength observations of this blazar are encouraged.

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R. E. Rutledge , Editor
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