SIMBAD references

We update the list of GeV-TeV extragalactic γ-ray sources using the two-year catalog from the Fermi Large-Area Telescope (LAT) and recent results from ground-based γ-ray telescopes. Breaks in the spectra between the high-energy (100MeV<E<300GeV) and the very high-energy (E>200GeV) ranges, as well as their dependence on distance, are discussed in the context of absorption on the extragalactic background light (EBL). We calculate the size of the expected break using a model for the EBL and compare it to the data, taking into account systematic uncertainties in the measurements. We develop a novel Bayesian model to describe this dataset and use it to constrain two simple models for the EBL-induced breaks.