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VERITAS Detection of Very High-Energy Gamma-Ray Emission from S3 1227+25

ATel #7516; Reshmi Mukherjee (Barnard College, Columbia University)
on 16 May 2015; 21:46 UT
Credential Certification: Reshmi Mukherjee (muk@astro.columbia.edu)

Subjects: Gamma Ray, >GeV, TeV, VHE, Request for Observations, AGN, Blazar

Referred to by ATel #: 7523, 7526, 7596

The VERITAS Collaboration reports the detection of very high energy(VHE; E> 100 GeV) gamma-ray emission above 120 GeV from the low-synchrotron-peaked BL Lac object S3 1227+25 (z=0.135, see Nass et al. 1996, A&A, 309, 419).VERITAS, an atmospheric Cherenkov telescope array, detected VHE emission with about 90 min of exposure on UT date 16 May 2015, with a statistical significance of greater than 5 standard deviations.The VERITAS observations of S3 1227+25 were motivated through communication with the Fermi Large Area Telescope (LAT) collaboration.Preliminary analysis shows that the source flux was 4.5 +/- 0.7 (stat) 10^-7 m^-2 s^-1 above 120 GeV. Observations at other wavelengths are encouraged.Questions regarding the VERITAS observations should be directed to Reshmi Mukherjee (muk@astro.columbia.edu).