Thomas Günther Bretz

Cette personne n’est plus à l’EPFL

Publications associées (25)

À propos
Confidentialité
Mentions légales

Graph Chatbot

Teraelectronvolt pulsed emission from the Crab Pulsar detected by MAGIC

Thomas Günther Bretz

Aims. We investigate the extension of the very high-energy spectral tail of the Crab Pulsar at energies above 400 GeV. Methods. We analyzed similar to 320 h of good-quality Crab data obtained with the MAGIC telescope from February 2007 to April 2014. Resul ...

Edp Sciences S A2016

Limits to dark matter annihilation cross-section from a combined analysis of MAGIC and Fermi-LAT observations of dwarf satellite galaxies

Thomas Günther Bretz

We present the first joint analysis of gamma-ray data from the MAGIC Cherenkov telescopes and the Fermi Large Area Telescope (LAT) to search for gamma-ray signals from dark matter annihilation in dwarf satellite galaxies. We combine 158 hours of Segue 1 ob ...

Iop Publishing Ltd2016

FIRST NuSTAR OBSERVATIONS OF MRK 501 WITHIN A RADIO TO TeV MULTI-INSTRUMENT CAMPAIGN

Thomas Günther Bretz, Xin Chen

We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 2013 April 1 and August 10, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign, the nearby BL La ...

Iop Publishing Ltd2015

Multiwavelength observations of Mrk 501 in 2008

Thomas Günther Bretz, Xin Chen

Context. Blazars are variable sources on various timescales over a broad energy range spanning from radio to very high energy (>100 GeV, hereafter VHE). Mrk 501 is one of the brightest blazars at TeV energies and has been extensively studied since its firs ...

Edp Sciences S A2015

MAGIC reveals a complex morphology within the unidentified gamma-ray source HESS J1857+026

Thomas Günther Bretz

Aims. HESS J1857+026 is an extended TeV gamma-ray source that was discovered by H. E. S. S. as part of its Galactic plane survey. Given its broadband spectral energy distribution and its spatial coincidence with the young energetic pulsar PSR J1856+0245, t ...

Edp Sciences S A2014

Design constraints on Cherenkov telescopes with Davies-Cotton reflectors

Mathieu Ribordy, Thomas Günther Bretz

This paper discusses the construction of high-performance ground-based gamma-ray Cherenkov telescopes with a Davies-Cotton reflector. For the design of such telescopes, usually physics constrains the field-of-view, while the photo-sensor size is defined by ...

Elsevier2013

Design and operation of FACT - the first G-APD Cherenkov telescope

Mathieu Ribordy, Werner Lustermann, Thomas Günther Bretz, Camille Haller

The First G-APD Cherenkov Telescope (FACT) is designed to detect cosmic gamma-rays with energies from several hundred GeV up to about 10 TeV using the Imaging Atmospheric Cherenkov Technique. In contrast to former or existing telescopes, the camera of the ...

Iop Publishing Ltd2013

Introducing the CTA concept

Mathieu Ribordy, Steve Couturier, Thomas Günther Bretz, Werner Lustermann, Christophe Bauer, Francisco Sanchez, Xiaoqing Zhou, Reto Frei, Etienne Antoine Julien Moulin, Michael Werner

The Cherenkov Telescope Array (CTA) is a new observatory for very high-energy (VHE) gamma rays. CTA has ambitions science goals, for which it is necessary to achieve full-sky coverage, to improve the sensitivity by about an order of magnitude, to span abou ...

Elsevier Science Bv2013

The simultaneous low state spectral energy distribution of 1ES 2344+514 from radio to very high energies

Thomas Günther Bretz

Context. BL Lacertae objects are variable at all energy bands on time scales down to minutes. To construct and interpret their spectral energy distribution (SED), simultaneous broad-band observations are mandatory. Up to now, the number of objects studied ...

Edp Sciences S A2013

G-APDs in Cherenkov astronomy: The FACT camera

Mathieu Ribordy, Werner Lustermann, Thomas Günther Bretz

Geiger-mode avalanche photodiodes (G-APD, SiPM) are a much discussed alternative to photomultiplier tubes in Cherenkov astronomy. The First G-APD Cherenkov Telescope (FACT) collaboration builds a camera based on a hexagonal array of 1440 G-APDs and has now ...

Elsevier Science Bv2012

Page 2 sur 3

Introducing the CTA concept

Mathieu Ribordy, Steve Couturier, Thomas Günther Bretz, Werner Lustermann, Christophe Bauer, Francisco Sanchez, Xiaoqing Zhou, Reto Frei, Etienne Antoine Julien Moulin, Michael Werner

Elsevier Science Bv2013

Limits to dark matter annihilation cross-section from a combined analysis of MAGIC and Fermi-LAT observations of dwarf satellite galaxies

Thomas Günther Bretz

Iop Publishing Ltd2016