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Discovery of VHE Gamma-Ray Emission from the Fermi-LAT Source PKS 1424+240

ATEL # 2084; Rene A. Ong (UCLA)
on 15 Jun 2009; 6:13 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 intermediate-frequency- peaked BL Lac object PKS 1424+240. The redshift of PKS 1424+240 is uncertain. This new VHE source was observed for ~14 hours of good- quality live time between 19 February 2009 and 14 June 2009 (UT) with the VERITAS atmospheric-Cherenkov telescope array, following the report of its detection with the Fermi-LAT as 0FGL J1427.1+2347 (Abdo et al., arXiv:0902.1340; Abdo et al., arXiv:0902.1559). Analysis of the VERITAS data yields a detection of ~190 gamma rays from PKS 1424+240 corresponding to a significance of >5 standard deviations. The VHE flux is ~2 percent of the Crab above 200 GeV. VERITAS will continue to observe PKS 1424+240 and contemporaneous multi-wavelength observations of this blazar are encouraged.

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