K. Berger

Multi-wavelength study of 1eRASS J085039.9−421151 with eROSITA, NuSTAR, and X-shooter

A. Zainab, A. Avakyan, Victor Doroshenko, P. Thalhammer et autres

The eROSITA instrument on board Spectrum-Roentgen-Gamma (SRG) has completed four scans of the X-ray sky, leading to the detection of almost one million X-ray sources in eRASS1 alone, including multiple new X-ray binary candidates. We report on analysis of the X-ray binary …

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The SRG/eROSITA all-sky survey

A. Merloni, G. Lamer, Teng Liu, Miriam E. Ramos-Ceja et autres

The eROSITA telescope array aboard the Spektrum Roentgen Gamma (SRG) satellite began surveying the sky in December 2019, with the aim of producing all-sky X-ray source lists and sky maps of an unprecedented depth. Here we present catalogues of both point-like and …

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Very high energy outburst of Markarian 501 in May 2009

E. Aliu, S. Archambault, Avery Archer, T. Arlen et autres

The very high energy (VHE; E> 100 GeV) blazar Markarian 501 was observed between April 17 and May 5 (MJD 54 938–54 956), 2009, as part of an extensive multi-wavelength campaign from radio to VHE. Strong VHE γ-ray activity was detected on …

us, ca, ie, Afrique du Sud, de, ar (code pays fourni par la source)

Discovery of very high energy gamma rays from 1ES 1440+122

S. Archambault, Avery Archer, A. Barnacka, B. Behera et autres

The BL Lacertae object 1ES 1440+122 was observed in the energy range from 85 GeV to 30 TeV by the VERITAS array of imaging atmospheric Cherenkov telescopes. The observations, taken between 2008 May and 2010 June and totalling 53 h, resulted in …

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Discovery of Very High Energy Gamma Rays from

S. Archambault, Avery Archer, A. Barnacka, B. Behera et autres

The BL Lacertae object 1ES 1440+122 was observed in the energy range from 85 GeV to 30 TeV by the VERITAS array of imaging atmospheric Cherenkov telescopes. The observations, taken between 2008 May and 2010 June and totalling 53 hours, resulted in …

Unprecedented study of the broadband emission of Mrk 421 during flaring activity in March 2010

J. Aleksic, S. Ansoldi, E. Bernardini, S. Paiano et autres

Context. Because of its proximity, Mrk 421 is one of the best sources on which to study the nature of BL Lac objects. Its proximity allows us to characterize its broadband spectral energy distribution (SED).\nAims. The goal is to better understand the …

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INVESTIGATING BROADBAND VARIABILITY OF THE TeV BLAZAR 1ES 1959+650

E. Aliu, S. Archambault, T. Arlen, T. Aune et autres

We summarize broadband observations of the TeV-emitting blazar 1ES 1959+650, including optical R -band observations by the robotic telescopes Super-LOTIS and iTelescope, UV observations by Swift Ultraviolet and Optical Telescope, X-ray observations by the Swift X-ray Telescope, high-energy gamma-ray observations with the …

us, ca, ie, de, in, Afrique du Sud (code pays fourni par la source)

The most powerful flaring activity from the NLSy1 PMN J0948+0022

Filippo D'Ammando, M. Orienti, Justin D. Finke, C. M. Raiteri et autres

We report on multifrequency observations performed during 2012 December–2013 August of the first narrow-line Seyfert 1 galaxy detected in γ-rays, PMN J0948+0022 (z = 0.5846). A γ-ray flare was observed by the Large Area Telescope on board Fermi during 2012 December–2013 January, …

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Multiwavelength observations of Mrk 501 in 2008

J. Aleksić, Stefano Ansoldi, Lucio Angelo Antonelli, P. Antoranz et autres

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 …

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CONSTRAINTS ON VERY HIGH ENERGY EMISSION FROM GRB 130427A

E. Aliu, T. Aune, A. Barnacka, M. Beilicke et autres

Prompt emission from the very fluent and nearby ( z = 0.34) gamma-ray burst GRB 130427A was detected by several orbiting telescopes and by ground-based, wide-field-of-view optical transient monitors. Apart from the intensity and proximity of this GRB, it is exceptional due …

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VERY-HIGH ENERGY OBSERVATIONS OF THE GALACTIC CENTER REGION BY VERITAS IN 2010-2012

Avery Archer, A. Barnacka, M. Beilicke, W. Benbow et autres

The Galactic center is an interesting region for high-energy (0.1–100 GeV) and very-high-energy ( E > 100 GeV) γ-ray observations. Potential sources of GeV/TeV γ-ray emission have been suggested, e.g., the accretion of matter onto the supermassive black hole, cosmic rays from …

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SPATIALLY RESOLVING THE VERY HIGH ENERGY EMISSION FROM MGRO J2019+37 WITH VERITAS

E. Aliu, T. Aune, B. Behera, M. Beilicke et autres

We present very high energy (VHE) imaging of MGRO J2019+37 obtained with the VERITAS observatory. The bright extended (∼2°) unidentified Milagro source is located toward the rich star formation region Cygnus-X. MGRO J2019+37 is resolved into two VERITAS sources. The faint, point-like …

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