[ SS1-1M Collaboration, 14. 1. 2026 ] The SST-1M Collaboration issued its second Astronomer’s Telegram (ATel #17597) on 14 January, reporting the detection of enhanced very-high-energy γ-ray activity from the nearby blazar Markarian 421 on 12 January 2026. Markarian 421 (Mrk 421 or Mkn 421) is one of the closest and brightest high-frequency peaked blazars at a redshift of z = 0.031, observed at very-high-energy (VHE; E ≳ 100 GeV) γ rays. Blazars are a class of Active Galactic Nuclei (AGN) with relativistic jets ejected from the central supermassive black hole (SMBH) that are closely aligned with the observer’s line...