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Table 3

Astronomical catalogs used for crossmatching.

Catalog Description Article Source type Matches
CRATES A large sample of bright, compact, flat-spectrum radio sources Healey et al. (2007) Radio sources 23
TeVCat An online database of Very High Energy (TeV) gamma-ray sources Wakely & Horan (2008) Gamma-ray sources
WIBRaLS A catalog of radio-loud candidate γ-ray emitting blazars assembled from WISE sources D’Abrusco et al. (2014) Blazars 8
Roma-BZCAT Fifth edition of the Roma-BZCAT catalog of blazars based on multifrequency surveys Massaro et al. (2015) Blazars 21
2WHSP A large list of high-synchrotron-peaked blazars (HSPs) Chang et al. (2017) Blazars 6
3HSP A sample of extreme and high-synchrotron-peaked (EHSP/HSP) blazars and candidates Chang et al. (2019) Blazars
2BIGB Gamma-ray analysis of EHSP and HSP blazars using 11-year Fermi-LAT data Arsioli et al. (2020) Blazars
MST-12yr A catalog of MST sources identified in 12-year Fermi-LAT data Campana & Massaro (2021) Gamma-ray sources 17
4FGL-DR4 Data Release 4 of the Fermi-LAT catalog based on 14 years of observations Ballet et al. (2024) Gamma-ray sources
1CGH Gamma-ray detections above 10 GeV based on 16 years of Fermi-LAT observations Arsioli et al. (2025) Gamma-ray sources 37

Notes. Summary of the catalogs used for crossmatching with photon clusters identified using SIMEFIC III followed by clustering with DBSCAN. The last column lists the number of positional matches found in our analysis.

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