Publications by Oleg Kalashev | EPFL Graph Search

Detection of the Geminga pulsar at energies down to 20 GeV with the LST-1 of CTAO

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

Context. Geminga is the third gamma-ray pulsar firmly detected by imaging atmospheric Cherenkov telescopes (IACTs) after the Crab and the Vela pulsars. Most of its emission is expected at tens of giga-electronvolts, and, out of the planned telescopes of th ...

2025

GRB 221009A: Observations with LST-1 of CTAO and Implications for Structured Jets in Long Gamma-Ray Bursts

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

GRB 221009A is the brightest gamma-ray burst (GRB) observed to date. Extensive observations of its afterglow emission across the electromagnetic spectrum were performed, providing the first strong evidence of a jet with a nontrivial angular structure in a ...

2025

Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

Context. The recurrent nova RS Ophiuchi (RS Oph) underwent a thermonuclear eruption in August 2021. In this event, RS Oph was detected by the High Energy Stereoscopic System (H.E.S.S.), the Major Atmospheric Gamma Imaging Cherenkov (MAGIC), and the first L ...

2025

Possibility of Multi-tev Secondary Gamma Rays From Grb221009a

Oleg Kalashev

The brightest gamma ray burst (GRB) ever observed, GRB221009A, produced a surprisingly large flux of gamma rays with multi-TeV energies, which are expected to be absorbed in interactions with extragalactic background light (EBL). If the highest energy gamm ...

AMER PHYSICAL SOC2025

Performance of the MAGIC stellar intensity interferometer and expansion to MAGIC + CTAO-LST1 stellar intensity interferometer

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

A new generation of optical intensity interferometers are emerging in recent years taking advantage of the existing infrastructure of Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC SII (Stellar Intensity Interferometer) in La Palma, Spain, has ...

SPIE2024

A new method of reconstructing images of gamma-ray telescopes applied to the LST-1 of CTAO

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

Context. Imaging atmospheric Cherenkov telescopes (IACTs) are used to observe very high-energy photons from the ground. Gamma rays are indirectly detected through the Cherenkov light emitted by the air showers they induce. The new generation of experiments ...

2024

Limit on the intergalactic magnetic field from the ultrahigh-energy cosmic ray hotspot in the Perseus-Pisces region

Andrii Neronov, Oleg Kalashev

The Telescope Array Collaboration has reported an evidence for existence of a source of ultrahigh energy cosmic ray events in Perseus-Pisces supercluster. We show that the mere existence of such a source imposes an upper bound on the strength of intergalac ...

American Physical Society2023