The FRAM telescopes data archive<\/span>
The FRAM robotic telescopes have been in operation for nearly two decades, producing a unique long-term dataset of wide-field sky images. The data includes observations of targeted astronomical sources, such as gamma-ray bursts, variable stars, and comets, as well as survey fields and atmospheric calibration images. The latter, although\r\noriginally acquired for calibration purposes, also constitute a valuable serendipitous survey of the large regions of the sky.\r\n\r\nTo make this dataset available to the scientific community in accordance with the FAIR principles - to make it Findable, Accessible, Interoperable, and Reusable - we have developed the FRAM Data Archive, a dedicated portal providing open access to more than six million images covering the whole sky. The archive allows users to search and retrieve original images, generate cutouts around specified sky positions, and access automatically derived photometric measurements for all objects detected in the images.\r\n\r\nWe describe the architecture and current capabilities of the archive, including automated data ingestion and maintenance, calibration-frame production, astrometric calibration, photometric reduction, and generation of higher-level data products. We discuss the challenges associated with this heterogeneous long term dataset and outline possible applications in time-domain astronomy, archival searches, education, and public scientific use.\r\n<\/p><\/div>
record_voice_over<\/i> Al\u017eb\u011bta Male\u0148\u00e1kov\u00e1 <\/span><\/b>
GRB optical afterglows: the first ten minutes<\/span>
The transition sharpness of the optical forward-shock onset in gamma-ray bursts (GRBs) has not been systematically quantified. I introduce a hyperbola parametrisation for afterglow light curves that measures the transition width logR at the onset peak, offering more stable MCMC convergence than standard smooth broken power laws. The method is applied to eight GRB afterglows: three events observed in detail with the D50, SBT, and FRAM at La Palma; three archival afterglows reprocessed from published data, including observations from BART, D50, and FRAM at Auger; and two further bursts from recent group work. A linear correlation between logR and p, the electron power-law index, is found across seven of these bursts: harder spectra correspond to sharper onset transitions. An errors-in-variables MCMC fit confirms a significant negative slope with small intrinsic scatter. The parametrisation provides a stable and extensible framework for characterising the afterglow onset across large archival samples.<\/p><\/div>
record_voice_over<\/i> Filip Novotn\u00fd <\/span><\/b>
Transient detection at the Ondrejov observatory<\/span>
In the era of wide-field surveys such as the Zwicky Transient Facility and the Vera C. Rubin Observatory, the role of small robotic telescopes has shifted from discovery to follow-up observations of newly detected transients. Their scientific use depends on the ability to adapt observing strategies in real time as data are acquired.\r\nI present an automated pipeline for transient detection and follow-up optimisation developed for the D50 and SBT telescopes at the Ond\u0159ejov Observatory. The system integrates real-time photometric reduction (pyrt), presented at this conference before, with afterglow modelling, transient detection and alerts from other facilities. \r\nThis approach has enabled early optical monitoring of several gamma-ray bursts and supernovae, including GRB 250702F (also discussed in the talk by Martin Jel\u00ednek).<\/p><\/div>
record_voice_over<\/i> Istvan Racz <\/span><\/b>
Synergizing Swift and VLT\/X-shooter Observations<\/span>
This study presents a systematic analysis of the neutral hydrogen (NH) column density in Gamma-Ray Burst (GRB) environments by combining legacy data with the latest observations. We extend our previous analysis of the 2012\u20132017 high-resolution VLT\/X-shooter spectroscopic data with the newest observations. The primary objective is to investigate the potential discrepancies between X-ray derived (from Swift\/XRT) and optical Lyman-alpha column densities across a wide redshift range. By integrating the newest X-shooter measurements, we aim to refine the constraints on the redshift dependence of NH and investigate the role of photo-ionization and circumburst clearing effects. Our results provide critical calibration for future high-energy missions, such as THESEUS, highlighting the necessity of multi-wavelength approaches in understanding the interstellar medium of GRB host galaxies.<\/p><\/div>
record_voice_over<\/i> Hendrik van Eerten <\/span><\/b>
interpreting and modelling gamma-ray bursts and similar high-energy transients<\/span>
The landscape of of high-energy astrophysical transients keeps expanding, owing to a long and growing list of successful space- and earth-based observatories gathering data across the broadband. A common thread connecting various phenomena from gamma-ray bursts and their afterglows to X-ray flashes and optical transients, is the release of fast-moving plasma producing some form of non-thermal emission. In order to understand the physics behind a given event, modelling therefore typically requires a combination of jet dynamics, radiative process modelling and a coherent framework to translate both to an observational prediction. In this presentation, I will describe a few recent transients where I have been involved in modelling (GRB 170817A, GRB221009A, GRB230307A, EP240408A, EP241021A). These will be used to illustrate the various approaches, both numerical and (semi-)analytical, that are taken in practice to interpret extreme transients.<\/p><\/div>
description<\/i> Zsolt Bagoly <\/span><\/b>
Testing CSR of GRB's spatial distribution<\/span>
Complete spatial randomness (CSR) describes a point process whereby point events occur within a given study area in a completely random fashion. It is synonymous with a homogeneous spatial Poisson process. Such a process is modeled using only one parameter $nu$ , i.e. the density of points within the defined area. \r\nAccording to observations, the angular distribution of GRBs follows this property within the limits of statistical inference. We studied the question, however, whether this property is also valid for a 3D space distribution consisting GRBs having measured redshifts. Slicing sample into quantiles by redshift we tested their CSR, separately.<\/p><\/div>
description<\/i> Istvan Racz <\/span><\/b>
Statistical properties of Greiner's GRB table<\/span>
The Jochen Greiner\u2019s GRB table represents one of the most comprehensive, although subjective, repository of Gamma-Ray Burst localizations, spanning several decades of observations from BeppoSAX to the latest missions like Swift, Fermi, and the Einstein Probe (EP). Due to the diverse nature of the instruments and localization procedures involved the statistical analysis of this dataset requires careful consideration of selection effects and instrumental biases. In this study, we perform a multi-dimensional statistical analysis of the Greiner table to uncover underlying patterns in the global properties of GRBs. By employing advanced statistical methods, we evaluate how the inclusion of various mission data affects the homogeneity of the catalog. Our results provide insights into the evolutionary effects of the GRB population and offer a critical assessment of the catalog's utility for cosmological studies. This work serves as a foundational statistical characterization of the dataset, supporting the synergy between legacy catalogs and future high-energy surveys.<\/p><\/div>
Small satellites & Instrumental session record_voice_over<\/i> 12 description<\/i> 2<\/span><\/h2>record_voice_over<\/i> Jan Ebr <\/span><\/b>
Stars as probes of our own atmosphere<\/span>
The FRAM robotic telescopes started as experimental tools for atmospheric monitoring at astroparticle observatories over two decades ago. Over time, both their purpose and methods have greatly changed, sometimes following unexpectedly twisting paths. The original design target of the FRAM at the Pierre Auger Observatory was the measurement of wavelength dependence of aerosol extinction using photoelectric measurements of bright stars. After this has proven prohibitively difficult, the program re-focused on rapid cloud detection along the apparent trajectory of interesting cosmic ray showers - and during these observations, the breakthrough method of aerosol measurement using wide-field photometry was developed, leading to the expansion of the FRAM project to support the upcoming Cherenkov Telescope Array Observatory. Eventually, we went full circle: using the exceptionally stable conditions at Roque de los Muchachos, we can now show that the wide-field method is actually the right way for the wavelength-dependence measurement. As this quantity is directly correlated with the size of the aerosol particles, we are here opening a new window for atmospheric physics at night, with possibly broad application far beyond simple atmospheric monitoring.<\/p><\/div>
record_voice_over<\/i> Jakub Kapu\u0161 <\/span><\/b>
Spacemanic Missions: Small Satellites for Space Weather, High-Energy Astrophysics and Amateur Radio<\/span>
Spacemanic has developed and operated a broad portfolio of small satellite missions spanning scientific, educational, and technology-demonstration objectives. This talk will provide an overview of selected missions focused on space weather, amateur radio experimentation, and gamma-ray burst detection, and will outline the common engineering and operational principles behind them. Particular emphasis will be placed on the mission architectures, payload functions, and the constraints imposed by nanosatellite platforms. The presentation will also discuss how these missions contribute to in-orbit validation, scientific data acquisition, and community engagement through compact and cost-efficient satellite systems. Together, they illustrate how small satellites can support a diverse range of objectives while remaining responsive to evolving scientific and technological needs.<\/p><\/div>
record_voice_over<\/i> Jakub Kapu\u0161 <\/span><\/b>
CORVUS IOV: Demonstrating a Scalable ESA Pioneer CubeSat Platform<\/span>
The CORVUS IOV mission is a 6U in-orbit validation flight of Spacemanic\u2019s CORVUS platform, developed under the ESA Pioneer Programme. The mission is designed to demonstrate the platform\u2019s modularity, scalability, and suitability for next-generation small satellite applications. It carries two demonstration payloads: a monochromatic camera for Earth observation and space-debris monitoring, and an SDR receiver for radio-environment measurements across multiple frequency bands. The talk will present the mission concept, platform architecture, and key subsystem features, including communications, power, onboard computing, and attitude control. It will also summarize the technical objectives of the IOV mission and discuss how CORVUS provides a flexible foundation for future EO, IoT, and technology-demonstration missions.<\/p><\/div>
record_voice_over<\/i> Bendeg\u00faz Koncz <\/span><\/b>
LED testing strategy and optical optimalisation of the THESEUS Infrared Telescope\u2019s Calibration Unit<\/span>
We present the Phase B planning of the Transient High-Energy Sky and Early Universe Surveyor (THESEUS) Infrared Telescope\u2019s Calibration Unit, carried out during Phase A, with emphasis on LED-based calibration concepts and optical design considerations. The work outlines a structured testing strategy that combines individual device characterization with batch-level validation to ensure consistent and reliable performance. In parallel, we investigate how different LED configurations and mounting approaches influence the optical behavior of the system. Ray-tracing simulations are used to explore light propagation and assess potential systematic effects impacting calibration accuracy. By integrating planned experimental activities with simulation-driven studies, this work establishes a solid foundation for the development of a robust and well-characterized calibration unit in Phase B.<\/p><\/div>
record_voice_over<\/i> Lucia Krivanekova <\/span><\/b>
Stratospheric balloons as research platforms within the ASTRABAX project<\/span>
Stratospheric balloons are frequently utilized experimental platforms within various research domains including meteorology, radiation physics, and astronomy. Thereby, the balloon gondola can be adapted to withstand multiple conditions and environmental requirements, ranging from an elementary construction for school projects up to complex designs for scientific NASA missions. The project ASTRABAX (\"Aschaffenburg Stratospheric Balloon Experiment\") investigated the radiation exposures of biological cells and of biomaterials in the upper atmosphere during a series of three stratospheric balloon flights. The continuously enhanced multimodal platform allowed to accommodate numerous device configurations within the UV- and temperature-controlled gondola. Here we show insights into the construction process, including achievements, present limitations and potential areas for improvement. Furthermore, the characterization of the stratospheric radiation environment during the multiple flights with different cosmic ray dosimeters is presented.\r\nThe results of the feasibility flights indicate the broadening potential for educational and research purposes where low costs, reduced work force, and 3D printing technology can enhance the implementation of experiments. An easy assembly facilitates the expeditious involvement of students in the fields of radiation research, astrophysics, modern materials, and astrobiology.\r\n<\/p><\/div>
record_voice_over<\/i> Jan Peter Lommler <\/span><\/b>
From Hits to Data: Realizing COSI's potential with Machine Learning<\/span>
The Compton Spectrometer and Imager (COSI) is scheduled for launch in 2027. It will cover a bandwidth from 0.2 to 5 MeV with its four main goals of shedding light into the origin of galactic positrons , enhancing our knowledge of stellar nucleosynthesis, giving insight into the most extreme environments via polarization and probing the physics of multimessenger events. The baseline data-pipeline relies on optimized conventional methods, with substantial heritage from prior gamma-ray missions. These are amended with machine learning based alternatives developed by multiple groups in the collaboration. The talk gives an overview of the upcoming mission and the activities in Mainz aimed at helping COSI to reach its full potential.\r\n\r\n<\/p><\/div>
record_voice_over<\/i> Ulvi Mehraliyev <\/span><\/b>
MATHEMATICAL MODELLING OF A PIEZOELECTRIC ACCELEROMETER<\/span>
Accelerometers are devices that sense acceleration and transmit it as an electrical signal to measurement units. Recently, accelerometers have made an important contributionto several fields such as aerospace, space, health monitoring, and other industries.This study is dedicated to the mathematical modelling and development of a newly developed three-axis piezoelectric accelerometer for space applications based on LEO CubeSat missions. The modelling, development, and required simulations are carried out using COMSOL Multiphysics software. The main objective of this work is to develop an easily manufacturable, cost-effective, and sensitive three-axis piezoelectric accelerometer for attitude determination systems in low Earth orbit based space applications.<\/p><\/div>
record_voice_over<\/i> Filip M\u00fcnz <\/span><\/b>
QUVIK Science Operations<\/span>
QUVIK is a Czech-led project of a small UV space telescope that has been selected and funded to be launched in year30\/31. Masaryk University will be primarily responsible for developing and running a Science Operation Center that has 2 main tasks: defining most scientifically valuable observation plan (taking into account constraints of Low Earth Orbit and the power budget) and creating the most performing data processing pipeline (with a very limited baseline of on-board data handling). Our experience of operations of small telescopes on ground (mostly run in automatized regime) is the principal ingredience in this development. First steps taken in the process closely supervised by ESA support team will be presented.<\/p><\/div>
record_voice_over<\/i> Rudi Reinhardt <\/span><\/b>
Clearence Measurements with a Compton Camera<\/span>
Clearance measurements of various rooms in nuclear power plants is an important step in the decommissioning of these facilities. Currently, wall sections are divided into 1 m\u00b2 areas, and their gamma spectra are measured individually to detect possible contaminations with different radioactive isotopes. Of particular interest here are \u00b9\u00b3\u2077Cs (662 keV) and \u2076\u2070Co (1173 and 1332 keV). To simplify this process by measuring whole rooms at once, we are developing a Compton camera (Radiation Source Locator, RSL7) for these clearance measurements in collaboration with project partners from Hellma Materials, Brenk Systemplanung, the Fraunhofer Institute for Scientific and Technical Trend Analysis (INT), and the Johannes Gutenberg University of Mainz. Based on the COSIpy analysis framework, developed for the NASA-SMEX mission COmpton Spectrometer and Imager (COSI), we are developing the software also for the RSL7. This involves fitting the activity of different radionuclides of previously created 3D models of all components of a room (template fit). In this talk, I will show simulations of the Compton camera, the processing of the response, and the fitting process using simulated datasets.<\/p><\/div>
record_voice_over<\/i> Vladim\u00edr Tich\u00fd <\/span><\/b>
Tests of Schmidt lobster eye based on new technology<\/span>