Atilla Kaan Alkan

Internship M2 (2020) + PhD (2021-2024)

During his internship Atilla worked on natural language processing of reports of astrophysical observations. He implemented his own version of a Word2Vec vector representation of GCN circulars. Atilla also joined the Astro-COLIBRI development team and improved the assessment of the observability of a source for ground based observatories. 
Atilla did a joint PhD thesis with experts from the LISN institute at the Paris-Saclay university. He implemented an artificial intelligence based pipeline to process reports on astrophysical observations (e.g. ATELs, GCN circulars, TNS astronotes, etc.). Using tools for natural language processing (NLP) these results help to improve the Astro-COLIBRI platform.

Dagmar Rozendal

Master internship (February-December 2024)

Dagmar is preparing a combined data science and astronomy masters at the Universtity of Groningen (Netherlands) under a joint supervision of Prof. Manuel Vecchi and Fabian Schüssler. She is was participating in observations of transients (especially GRBs) with H.E.S.S. and the development of Astro-COLIBRI, especially the implementation of optical lightcurves.

Mathieu de Bony de Lavergne

Postdoctoral researcher (2023-2024)

Mathieu joined the group in early 2023 funded via the ANR "MOTS" grant. He was working on very-high-energy gamma-ray observations with H.E.S.S. and CTA/LST-1, as well on the development of Astro-COLIBRI. 

Jayson Mourier

Master MIAGE alternance (2022-2024)

Jayson joined the group in autumn 2022. He was alternating between his Master studies at the university of Nanterre ("MIAGE" program) and hands-on experience with the development of Astro-COLIBRI.

Patrick Reichherzer

PhD (2019-2022) + collaborator (since 2022)

Patrick did a joint PhD program between the university Paris-Saclay and the Ruhr-Universität Bochum (RUB). He started his PhD work at RUB under the supervision of Prof. J. Tjus on modelling of the diffusion of cosmic rays in highly turbulent  magnetic environments. During his stay at IRFU in 2020 he worked mainly on studies of VHE emission of AGNs with H.E.S.S. and the Astro-COLIBRI transient tool. Patrick graduated from RUB and the university Paris-Saclay in 2022. Since then he is participating in the group activities as external collaborator.

Valentin Lefranc

Postdoctoral researcher (2021-2023)

Valentin was leading the development of the Astro-COLIBRI transient tool. After a PhD thesis in our group at IRFU/CEA and Desy-Zeuthen (Berlin, Germany) he was developing Machine Learning tools as freelance software developer and for different start-ups before joining us again for a postdoctoral position. 

Halim Ashkar

Internship M2 (2018) + PhD (2018-2021)

During his internship Halim analyzed the H.E.S.S. observations obtained after the detection of gravitational waves from the binary black hole merger GW170814. As expected, no high-energy gamma-ray emission was found and limits on the full localisation region of the event could be derived.
During his PhD Halim was focussing on the study of multi-messenger transients at very-high energies. He is mainly searching for VHE gamma-ray counterparts to gravitational waves and Fast Radio Bursts with H.E.S.S. and CTA. See for example here.
Halim is currently working as postdoctoral researcher at LLR/Palaiseau.

Monica Seglar-Arroyo

Internship M2 (2016) + PhD (2016-2019)

During her internship Monica developed a detailed, time dependent model of the atmosphere above the H.E.S.S. observatory, which allowed to verify the model used in the H.E.S.S. simulations and estimate remaining systematic uncertainties.
During her PhD Monica was working on the study of multi-messenger transients, focussing mainly on searches for high-energy gamma-ray counterparts to gravitational waves with H.E.S.S./CTA and HAWC. She was also involved in the study of other transient phenomena like AGN flares with high-energy observatories. Monica spent one year at PennState (US) before finalizing her PhD at the Université Paris-Saclay in 2019.
​She was working as a postdoctoral researcher in the Virgo collaboration at LAPP (Annecy, France) before joining IFAE (Barcelona, Spain).

Anke Yusafzai

Internship M2 (2019)

During her internship Anke started to develop Astro-COLIBRI, a novel framework summarizing stable and (most importantly) transient phenomena. Using data from a number of catalogs and the VoEventDB, Astro-COLIBRI provides easy access to what is going on in a given patch of the sky and thus enables, facilitates and improves dedicated follow-up observations of multi-messenger transients.

Nicolas Renault-Tinacci

Internship M1 (2010)

During his internship Nicolas developed a novel, Monte Carlo independent, method to estimate the angular resolution of the event reconstruction of the ANTARES neutrino telescope.