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We present the 1-100 GeV spectral energy distribution for a population of 148high-synchrotron-peaked blazars (HSPs) recently detected with Fermi-LAT as partof the First Brazil-ICRANet Gamma-ray Blazar catalogue (1BIGB). Most of the1BIGB sources do not appear in previous Fermi-LAT catalogues and theirgamma-ray spectral properties are presented here for the first time,representing a significant new extension of the gamma-ray blazar population.Since our sample was originally selected from an excess signal in the 0.3-500GeV band, the sources stand out as promising TeV blazar candidates, potentiallyin reach of the forthcoming very-high-energy (VHE) gamma-ray observatory, CTA.The flux estimates presented here are derived considering PASS8 data,integrating over more than 9 years of Fermi-LAT observations. We also reviewthe full broadband fit between 0.3-500 GeV presented in the original 1BIGBpaper for all sources, updating the power-law parameters with currentlyavailable Fermi-LAT dataset. The importance of these sources in the context ofVHE population studies with both current instruments and the future CTA isevaluated. To do so, we select a subsample of 1BIGB sources and extrapolatetheir gamma-ray SEDs to the highest energies, properly accounting forabsorption due to the extragalactic background light. We compare thoseextrapolations to the published CTA sensitivity curves and estimate theirdetectability by CTA. Two notable sources from our sample, namely 1BIGBJ224910.6-130002 and 1BIGB J194356.2+211821, are discussed in greater detail.All gamma-ray SEDs, which are shown here for the first time, are made publiclyavailable via the Brazilian Science Data Center (BSDC) service, maintained atCBPF, in Rio de Janeiro.

Extreme & High Synchrotron Peaked Blazars at the limit of Fermi-LAT detectability: the $\gamma$-ray spectrum of 1BIGB sources