Type-II radio bursts are usually observed below 400 MHz with slowly-drifting narrow fundamental and/or harmonic bands. Events with starting frequencies higher than 400 MHz are rarely reported (e.g., Pohjolainen et al. 2008). Such high-frequency Type-IIs may stem from the CME interaction with surrounding dense structures in the corona, such as streamers, ray-like or loop structure, or from sources in the lower corona.

On Friday, November 7, we received the sad news on the passing of Grzegorz Sęk – a teacher, educator, and astronomer also associated with our Observatory.

In August 2025, the LIGO-Virgo-KAGRA (LVK) Collaborations released the interferometric strain data from the first part of the fourth observing run (O4a), which ran from May 2023 to January 2024. In this data, we have discovered 128 new confident gravitational-wave signals originating from merging black holes and neutron stars. Alongside the strain data release, we publish version 4.0 of the Gravitational Wave Transient Catalog (GWTC-4.0), which contains lists of the candidate signals and measurements of their properties.

A week ago, during the “II EU Workshop on Water Cherenkov Experiments for Precision Physics” conference co-organized by the OAUJ, Jagiellonian University hosted Japanese physicist Takaaki Kajita, who, together with Canadian Arthur B. McDonald, received the 2015 Nobel Prize in Physics for the discovery of neutrino oscillations. “This discovery has changed our understanding of the deepest secrets of matter and may prove crucial to our understanding of the Universe,” the Nobel Committee explained.

On Monday, September 15, at the Nicolaus Copernicus University Astronomical Observatory in Piwnice, Prof. Wojciech Macyk, PhD, Vice-Rector for Science at the Jagiellonian University, signed an agreement establishing the Polish Consortium for the SKA Observatory project.

Extragalactic jets, which are among the most powerful astrophysical phenomena, are collimated streams of gas ejected at high speeds from astronomical objects, in particular active galactic nuclei (AGNs). They can create huge clouds of matter bright at radio wavelengths, extending far beyond the boundaries of their host galaxy. If such sources reach sizes larger than 0.7 megaparsecs, we call them Giant Radio Galaxies (GRGs). Here we present an unusual object of this kind – a radio source J1350-1634 with two visible pairs of lobes, hosted by LEDA 896325 – the largest GRG hosted by a spiral galaxy known to date.

On the last Friday of September, you are welcome to visit our Observatory.

The Planetary Science Conference 2025 will be held on October 23–25, 2025, at the Jagiellonian University in Krakow. This international scientific conference is dedicated to planetary science and space exploration. The event will be held in a hybrid format, and participation is free of charge, but requires prior registration.