Simon P. Swordy

Cosmic Ray Energetics and Mass: First Flight and Beyond

E. S. Seo, M.Y. Kim, J.K. Lee, Ramin Sina et autres

The Cosmic Ray Energetics And Mass instrument is configured with particle detectors to measure cosmic-ray composition from protons to iron nuclei over the energy range from ~1011 to ~1015 eV in a series of balloon flights. The goal is to observe cosmic-ray …

VERITAS OBSERVATIONS OF GAMMA-RAY BURSTS DETECTED BYSWIFT

V. A. Acciari, E. Aliu, T. Arlen, T. Aune et autres

We present the results of 16 Swift -triggered Gamma-ray burst (GRB) follow-up observations taken with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) telescope array from 2007 January to 2009 June. The median energy threshold and response time of these observations …

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The track imaging Cherenkov experiment

Stephanie A. Wissel, K. Byrum, J. Cunningham, G. Drake et autres

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TeV AND MULTI-WAVELENGTH OBSERVATIONS OF Mrk 421 IN 2006-2008

V. A. Acciari, E. Aliu, T. Arlen, T. Aune et autres

We report on TeV γ-ray observations of the blazar Mrk 421 (redshift of 0.031) with the VERITAS observatory and the Whipple 10 m Cherenkov telescope. The excellent sensitivity of VERITAS allowed us to sample the TeV γ-ray fluxes and energy spectra with …

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ERRATUM: “MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER” (2011, ApJ, 726, 43)

A. A. Abdo, M. Ackermann, Marco Ajello, L. Baldini et autres

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SPECTRAL ENERGY DISTRIBUTION OF MARKARIAN 501: QUIESCENT STATE VERSUS EXTREME OUTBURST

V. A. Acciari, T. Arlen, T. Aune, M. Beilicke et autres

The very high energy (VHE; E > 100 GeV) blazar Markarian 501 (Mrk 501) has a well-studied history of extreme spectral variability and is an excellent laboratory for studying the physical processes within the jets of active galactic nuclei. However, there are …

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INSIGHTS INTO THE HIGH-ENERGY γ-RAY EMISSION OF MARKARIAN 501 FROM EXTENSIVE MULTIFREQUENCY OBSERVATIONS IN THE FERMI ERA

A. A. Abdo, M. Ackermann, Marco Ajello, A. Allafort et autres

We report on the γ-ray activity of the blazar Mrk 501 during the first 480 days of Fermi operation. We find that the average Large Area Telescope (LAT) γ-ray spectrum of Mrk 501 can be well described by a single power-law function …

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Multiwavelength Observations of the Very High Energy Blazar 1ES 2344+514

VERITAS Collaboration, V. Acciari, E. Aliu, T. Arlen et autres

Multiwavelength observations of the high-frequency-peaked blazar 1ES 2344+514 were performed from October 2007 to January 2008. The campaign represents the first contemporanous data on the object at very high energy (VHE, E > 100 GeV) gamma-ray, X-ray, and UV energies. Observations with …

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MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER

A. A. Abdo, M. Ackermann, Marco Ajello, L. Baldini et autres

The BL Lacertae object 3C 66A was detected in a flaring state by the Fermi Large Area Telescope (LAT) and VERITAS in 2008 October. In addition to these gamma-ray observations, F-GAMMA, GASP-WEBT, PAIRITEL, MDM, ATOM, Swift , and Chandra provided radio to …

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ERRATUM: “VERITAS OBSERVATIONS OF A VERY HIGH ENERGY γ-RAY FLARE FROM THE BLAZAR 3C 66A” (2009, ApJ, 693, L104)

V. A. Acciari, E. Aliu, T. Arlen, M. Beilicke et autres

In the published paper, there was an error in the calculation of the blazar's intrinsic photon spectrum.The intrinsic photon spectrum was determined from the observed VERITAS spectrum by removing the effects of γ -ray absorption on the extragalactic background light (EBL) using …

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DISCOVERY OF VERY HIGH ENERGY γ-RAY EMISSION FROM THE SNR G54.1+0.3

V. A. Acciari, E. Aliu, T. Arlen, T. Aune et autres

We report the discovery of very high energy (VHE) gamma-ray emission from the direction of the SNR G54.1+0.3 using the VERITAS ground-based gamma-ray observatory. The TeV signal has an overall significance of 6.8σ and appears pointlike given the resolution of the instrument. …

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Results from the first two years of VERITAS observations

Frank Krennrich, M. A. Bautista, M. Beilicke, W. Benbow et autres

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