Publications (105)
The Flux Variability of Markarian 501 in Very High Energy Gamma Rays
J. Quinn, I. H. Bond, P. J. Boyle +26
The BL Lacertae object Markarian 501 was identified as a source of gamma-ray emission at the Whipple Observatory in March 1995. Here we present a flux variability analysis on sever…
Long term observations of B2 1215+30 with VERITAS
VERITAS collaboration, E. Aliu, S. Archambault +82
We report on VERITAS observations of the BL Lac object B2 1215+30 between 2008 and 2012. During this period, the source was detected at very high energies (VHE; E > 100 GeV) by VER…
New Limits to the IR Background: Bounds on Radiative Neutrino Decay and on VMO Contributions to the Dark Matter Problem
S. D. Biller, J. Buckley, A. Burdett +20
From considering the effect of gamma-gamma interactions on recently observed TeV gamma-ray spectra, improved limits are set to the density of extragalactic infrared (IR) photons wh…
A Search for Pulsed TeV Gamma Ray Emission from the Crab Pulsar
A. M. Burdett, I. H. Bond, P. J. Boyle +28
We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10m gamma-ray telescope. The direction of the Crab pulsar was observ…
Optical SETI with Imaging Cherenkov Telescopes
J. Holder, P. Ashworth, S. LeBohec +2
The idea of searching for optical signals from extraterrestrial civilizations has become increasingly popular over the last five years, with dedicated projects at a number of obser…
Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS
V. A. Acciari, M. Beilicke, G. Blaylock +74
The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in Active Galactic Nuclei from radio waves to Te…
VERITAS 2008 - 2009 monitoring of the variable gamma-ray source M87
The VERITAS Collaboration, V. A. Acciari, E. Aliu +84
M87 is a nearby radio galaxy that is detected at energies ranging from radio to VHE gamma-rays. Its proximity and its jet, misaligned from our line-of-sight, enable detailed morpho…
Discovery of TeV Gamma-ray Emission from CTA 1 by VERITAS
E. Aliu, S. Archambault, T. Arlen +88
We report the discovery of TeV gamma-ray emission coincident with the shell-type radio supernova remnant (SNR) CTA 1 using the VERITAS gamma-ray observatory. The source, VER J0006+…
VERITAS Collaboration Contributions to the 32nd International Cosmic Ray Conference
The VERITAS Collaboration, E. Aliu, T. Arlen +96
Compilation of papers contributed by the VERITAS Collaboration to the 32nd International Cosmic Ray Conference, held 11-18 August 2011 in Beijing, China.
Observations of the Unidentified TeV Gamma-Ray Source TeV J2032+4130 with the Whipple Observatory 10 m Telescope
A. Konopelko, R. W. Atkins, G. Blaylock +58
We report on observations of the sky region around the unidentified TeV gamma-ray source TeV J2032+4130 carried out with the Whipple Observatory 10 m atmospheric Cherenkov telescop…
A connection between star formation activity and cosmic rays in the starburst galaxy M 82
V. A. Acciari, E. Aliu, T. Arlen +89
Although Galactic cosmic rays (protons and nuclei) are widely believed to be dominantly accelerated by the winds and supernovae of massive stars, definitive evidence of this origin…
Observations of the unidentified gamma-ray source TeV J2032+4130 by VERITAS
VERITAS Collaboration, E. Aliu, T. Aune +77
TeV J2032+4130 was the first unidentified source discovered at very high energies (VHE; E 100 GeV), with no obvious counterpart in any other wavelength. It is also the first ex…
VERITAS Observations of day-scale flaring of M87 in 2010 April
E. Aliu, T. Arlen, T. Aune +88
VERITAS has been monitoring the very-high-energy (VHE; >100GeV) gamma-ray activity of the radio galaxy M87 since 2007. During 2008, flaring activity on a timescale of a few days wa…
VERITAS Observations of the gamma-Ray Binary LS I +61 303
V. A. Acciari, M. Beilicke, G. Blaylock +74
LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy gamma-rays. The system was observed over several orbital cycl…
VERITAS Observations of the Microquasar Cygnus X-3
S. Archambault, M. Beilicke, W. Benbow +76
We report results from TeV gamma-ray observations of the microquasar Cygnus X-3. The observations were made with the Very Energetic Radiation Imaging Telescope Array System (VERITA…
Highlight Talk: Recent Results from VERITAS
R. A. Ong, V. A. Acciari, T. Arlen +79
VERITAS is a state-of-the-art ground-based gamma-ray observatory that operates in the very high-energy (VHE) region of 100 GeV to 50 TeV. The observatory consists of an array of fo…
The Very Energetic Radiation Imaging Telescope Array System (VERITAS)
S. M. Bradbury, I. H. Bond, A. C. Breslin +32
We give an overview of the current status and scientific goals of VERITAS, a proposed hexagonal array of seven 10 m aperture imaging Cherenkov telescopes. The selected site is Mont…
A Search for TeV Emission from Unidentified Sources in the Galactic Plane
J. H. Buckley, P. J. Boyle, S. M. Bradbury +24
The ~70 unidentified sources of the EGRET sky survey may be one of its most important legacies. The identification of these sources at other wavelengths is critical to understandin…
A Very High Energy Gamma-Ray Spectrum of 1ES 2344+514
M. Schroedter, H. M. Badran, J. H. Buckley +26
The BL Lacertae (BL Lac) object 1ES 2344+514 (1ES 2344), at a redshift of 0.044, was discovered as a source of very high energy (VHE) gamma rays by the Whipple Collaboration in 199…
Discovery of Very High-Energy Gamma-Ray Radiation from the BL Lac 1ES 0806+524
VERITAS Collaboration, V. Acciari, E. Aliu +90
The high-frequency-peaked BL-Lacertae object \objectname{1ES 0806+524}, at redshift z=0.138, was observed in the very-high-energy (VHE) gamma-ray regime by VERITAS between November…
Multiwavelength Observations of a Flare from Markarian 501
M. Catanese, S. M. Bradbury, A. C. Breslin +23
We present multiwavelength observations of the BL Lacertae object Markarian 501 (Mrk 501) in 1997 between April 8 and April 19. Evidence of correlated variability is seen in very h…
Discovery of Variability in the Very High Energy Gamma-Ray Emission of 1ES 1218+304 with VERITAS
The VERITAS Collaboration, V. A. Acciari, E. Aliu +68
We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although 1ES 1218+304 was detected previously…
Search for Pulsed TeV Gamma-ray Emission from the Crab Pulsar
R. W. Lessard, I. H. Bond, S. M. Bradbury +23
We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10 m gamma-ray telescope. The direction of the Crab pulsar was obser…
VERITAS Deep Observations of the Dwarf Spheroidal Galaxy Segue 1
E. Aliu, S. Archambault, T. Arlen +90
The VERITAS array of Cherenkov telescopes has carried out a deep observational program on the nearby dwarf spheroidal galaxy Segue 1. We report on the results of nearly 48 hours of…
Spectrum of TeV Gamma-Rays from the Crab Nebula
D. A. Carter-Lewis, S. Biller, P. J. Boyle +24
The Crab Nebula has become established as the standard candle for TeV gamma-ray astronomy using the atmospheric Cherenkov technique. No evidence for variability has been seen. The…
Discovery of High-energy and Very High Energy Gamma-ray Emission from the Blazar RBS 0413
VERITAS Collaboration, E. Aliu, S. Archambault +93
We report on the discovery of high-energy (HE; E > 0.1 GeV) and very high-energy (VHE; E > 100 GeV) gamma-ray emission from the high-frequency-peaked BL Lac object RBS 0413. VERITA…
Multiwavelength observations of Mrk 501 in 2008
MAGIC Collaboration, J. AleksiÄ, S. Ansoldi +256
Mrk 501 is one of the brightest blazars at TeV energies and has been extensively studied since its first VHE detection in 1996. Our goal is to characterize in detail the source gam…
Discovery of VHE -ray emission from the SNR G54.1+0.3
V. A. Acciari, E. Aliu, T. Arlen +79
We report the discovery of very high energy 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 o…
Very High Energy Gamma-Ray Emission from the Blazar Markarian 421
M. S. Schubnell, C. W. Akerlof, S. Biller J. Buckley +17
Very high energy gamma-ray emission from the BL Lac object Markarian 421 has been detected over three observing seasons on 59 nights between April 1992 and June 1994 with the Whipp…
Discovery of TeV Gamma Ray Emission from Tycho's Supernova Remnant
V. A. Acciari, E. Aliu, T. Arlen +82
We report the discovery of TeV gamma-ray emission from the Type Ia supernova remnant (SNR) G120.1+1.4, known as Tycho's supernova remnant. Observations performed in the period 2008…
The 2009 multiwavelength campaign on Mrk 421: Variability and correlation studies
MAGIC Collaboration, J. AleksiÄ, S. Ansoldi +270
We performed a 4.5-month multi-instrument campaign (from radio to VHE gamma rays) on Mrk421 between January 2009 and June 2009, which included VLBA, F-GAMMA, GASP-WEBT, Swift, RXTE…
VERITAS Discovery of >200GeV Gamma-ray Emission from the Intermediate-frequency-peaked BL Lac Object W Comae
VERITAS Collaboration, V. A. Acciari, E. Aliu +80
We report the detection of very high-energy gamma-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae (z=0.102) by VERITAS. The source was observed betwe…
VERITAS observations of the BL Lac 1ES 1218+304
VERITAS Collaboration, V. A. Acciari, E. Aliu +78
The VERITAS collaboration reports the detection of very-high-energy (VHE) gamma-ray emission from the high-frequency-peaked BL Lac object 1ES 1218+304 located at a redshift of z=0.…
Detection of Pulsed Gamma Rays Above 100 GeV from the Crab Pulsar
VERITAS Collaboration, E. Aliu, T. Arlen +93
We report the detection of pulsed gamma rays from the Crab pulsar at energies above 100 Gigaelectronvolts (GeV) with the VERITAS array of atmospheric Cherenkov telescopes. The dete…
Multiwavelength Observations of Markarian 421 in March 2001: an Unprecedented View on the X-ray/TeV Correlated Variability
G. Fossati, J. H. Buckley, I. H. Bond +26
(Abridged) We present a detailed analysis of week-long simultaneous observations of the blazar Mrk421 at 2-60 keV X-rays (RXTE) and TeV gamma-rays (Whipple and HEGRA) in 2001. The…
TeV Gamma-Ray Observations of the Perseus and Abell 2029 Galaxy Clusters
J. S. Perkins, H. M. Badran, G. Blaylock +41
Galaxy clusters might be sources of TeV gamma rays emitted by high-energy protons and electrons accelerated by large scale structure formation shocks, galactic winds, or active gal…
Tev Blazars: Status of Observations
F. Krennrich, S. D. Biller, I. H. Bond +28
The close relation between ground-based TeV observations and satellite borne -ray measurements has been important for the understanding of blazars. The observations which invol…
Discovery of >350 GeV Gamma Rays from the BL Lacertae Object 1ES 2344+514
M. Catanese, C. W. Akerlof, H. M. Badran +31
We present the discovery of >350 GeV gamma-ray emission from the BL Lacertae object 1ES 2344+514 with the Whipple Observatory 10m gamma-ray telescope. This is the third BL Lac obje…
Search for a correlation between very-high-energy gamma rays and giant radio pulses in the Crab pulsar
E. Aliu, S. Archambault, T. Arlen +87
We present the results of a joint observational campaign between the Green Bank radio telescope and the VERITAS gamma-ray telescope, which searched for a correlation between the em…
VERITAS: Very LArge Energetic Radiation Imaging Telescope Array System
T. C. Weekes, C. Akerlof, S. Biller +37
A next generation atmospheric Cherenkov observatory is described based on the Whipple Observatory -ray telescope. A total of nine such imaging telescopes will be deployed in an…
Evidence for long-term Gamma-ray and X-ray variability from the unidentified TeV source HESS J0632+057
VERITAS Collaboration, V. A. Acciari, E. Aliu +79
HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the m…
Search for TeV Gamma-Rays from Shell-Type Supernova Remnants
Whipple Collaboration, R. W. Lessard, I. H. Bond +26
If cosmic rays with energies <100 TeV originate in the galaxy and are accelerated in shock waves in shell-type supernova remnants (SNRs), gamma-rays will be produced as the result…
The First VERITAS Telescope
J. Holder, R. W. Atkins, H. M. Badran +73
The first atmospheric Cherenkov telescope of VERITAS (the Very Energetic Radiation Imaging Telescope Array System) has been in operation since February 2005. We present here a tech…
Recent Results from the VERITAS Collaboration
F. Krennrich, I. H. Bond, S. M. Bradbury +36
A decade after the discovery of TeV gamma-rays from the blazar Mrk 421 (Punch et al. 1992), the list of TeV blazars has increased to five BL Lac objects: Mrk 421 (Punch et al. 1992…
Cutoff in the TeV Energy Spectrum of Markarian 421 During Strong Flares in 2001
F. Krennrich, H. M. Badran, I. H. Bond +43
Exceptionally strong and long lasting flaring activity of the blazar Markarian 421 (Mrk 421) occurred between January and March 2001. Based on the excellent signal-to-noise ratio o…
What Are Gamma-Ray Bursts -- The Unique Role of Very High Energy Gamma-Ray Observations
D. A. Williams, A. D. Falcone, M. G. Baring +20
Gamma-ray bursts (GRBs) have been an enigma since their discovery forty years ago. However, considerable progress unraveling their mysteries has been made in recent years. Developm…
Gamma-ray Observations of the Galactic Plane at Energies E > 500 GeV
S. LeBohec, I. H. Bond, S. M. Bradbury +25
In 1998 and 1999 the Whipple Observatory 10 m telescope was used to search for diffuse gamma ray emission from the Galactic Plane. No signifiant evidence of emission was found. Ass…
VERITAS Upper Limit on the VHE Emission from the Radio Galaxy NGC 1275
VERITAS Collaboration, V. A. Acciari, E. Aliu +88
The recent detection by the Fermi gamma-ray space telescope of high-energy gamma-rays from the radio galaxy NGC 1275 makes the observation of the very high energy (VHE: E > 100 GeV…
Multiwavelength observations and modeling of 1ES 1959+650 in a low flux state
VERITAS Collaboration, E. Aliu, S. Archambault +82
We report on the VERITAS observations of the high-frequency peaked BL Lac object 1ES 1959+650 in the period 2007-2011. This source is detected at TeV energies by VERITAS at 16.4 st…
First Results from a Search for TeV Emission from BL Lacs
M. Catanese, P. J. Boyle, J. H. Buckley +22
Two active galactic nuclei have been detected at TeV energies using the atmospheric Cherenkov imaging technique. The Whipple Observatory gamma-ray telescope has been used to observ…
Investigating Broadband Variability of the TeV Blazar 1ES 1959+650
E. Aliu, S. Archambault, T. Arlen +92
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 observat…
Very High Energy Observations of Gamma-Ray Burst Locations with the Whipple Telescope
D. Horan, R. W. Atkins, H. M. Badran +56
Gamma-ray burst (GRB) observations at very high energies (VHE, E > 100 GeV) can impose tight constraints on some GRB emission models. Many GRB afterglow models predict a VHE compon…
The Discovery of gamma-Ray Emission From The Blazar RGB J0710+591
V. A. Acciari, E. Aliu, T. Arlen +234
The high-frequency-peaked BL Lacertae object RGB J0710+591 was observed in the very high-energy (VHE; E > 100 GeV) wave band by the VERITAS array of atmospheric Cherenkov telescope…
Tev Observations of the Variability and Spectrum of Markarian 421
J. E. McEnery, I. H. Bond, P. J. Boyle +27
Markarian 421 was the first extragalactic source to be detected with high statistical certainty at TeV energies. The Whipple Observatory gamma-ray telescope has been used to observ…
VERITAS Observations of Six Bright, Hard-Spectrum Fermi-LAT Blazars
E. Aliu, S. Archambault, T. Arlen +84
We report on VERITAS very-high-energy (VHE; E>100 GeV) observations of six blazars selected from the Fermi Large Area Telescope First Source Catalog (1FGL). The gamma-ray emission…
On the application of differences in intrinsic fluctuations of Cherenkov light images for separation of air showers
V. V. Bugaev, A. V. Plyasheshnikov, V. V. Vassiliev +1
The sensitivity of ground-based imaging atmospheric Cherenkov gamma-ray observatories depends critically on the primary particle identification methods which are used to retain pho…
Discovery of a new TeV gamma-ray source: VER J0521+211
VERITAS Collaboration, S. Archambault, T. Arlen +83
We report the detection of a new TeV gamma-ray source, VER J0521+211, based on observations made with the VERITAS imaging atmospheric Cherenkov telescope array. These observations…
VHE gamma-ray observations of Markarian 501
Whipple Collaboration, A. C. Breslin, I. H. Bond +29
Markarian 501, a nearby (z=0.033) X-ray selected BL Lacertae object, is a well established source of Very High Energy (VHE, E>=300 GeV) gamma rays. Dramatic variability in its gamm…
Rapid TeV Gamma-Ray Flaring of BL Lacertae
T. Arlen, T. Aune, M. Beilicke +83
We report on the detection of a very rapid TeV gamma-ray flare from BL Lacertae on 2011 June 28 with the Very Energetic Radiation Imaging Telescope Array System (VERITAS). The flar…
Constraints on Cosmic-Ray Origin Theories from TeV Gamma-Ray Observations
R. W. Lessard, P. J. Boyle, S. M. Bradbury +23
If supernova remnants (SNRs) are the sites of cosmic-ray acceleration, the associated nuclear interactions should result in observable fluxes of TeV gamma-rays from the nearest SNR…
Hour-Scale Multiwavelength Variability in Markarian 421
M. Catanese, I. H. Bond, S. M. Bradbury +36
Markarian 421 was observed for about four days with BeppoSAX and the Whipple Observatory gamma-ray telescope in April 1998. A pronounced, well-defined, flare with hour-scale variab…
Observation of Extended VHE Emission from the Supernova Remnant IC 443 with VERITAS
VERITAS Collaboration, V. A. Acciari, E. Aliu +90
We present evidence that the very-high-energy (VHE, E > 100 GeV) gamma-ray emission coincident with the supernova remnant IC 443 is extended. IC 443 contains one of the best-studie…
Evidence for TeV gamma ray emission from TeV J2032+4130 in Whipple archival data
M. J. Lang, D. A. Carter-Lewis, D. J. Fegan +6
A reanalysis of data taken on the Cygnus region in 1989-90 using the Whipple Observatory atmospheric Cherenkov imaging telescope confirms the existence of the TeV J2032+4130 source…
Discovery of TeV Gamma-ray Emission Toward Supernova Remnant SNR G78.2+2.1
E. Aliu, S. Archambault, T. Arlen +97
We report the discovery of an unidentified, extended source of very-high-energy (VHE) gamma-ray emission, VER J2019+407, within the radio shell of the supernova remnant SNR G78.2+2…
Gamma-ray observations of the Be/pulsar binary 1A 0535+262 during a giant X-ray outburst
VERITAS collaboration, V. A. Acciari, E. Aliu +73
Giant X-ray outbursts, with luminosities of about erg s, are observed roughly every 5 years from the nearby Be/pulsar binary 1A 0535+262. In this article, we pres…
Multiwavelength Observations of The TeV Binary LS I +61 303 with VERITAS, Fermi-LAT and Swift-XRT During a TeV Outburst
E. Aliu, S. Archambault, B. Behera +71
We present the results of a multiwavelength observational campaign on the TeV binary system LS I +61 303 with the VERITAS telescope array (>200 GeV), Fermi-LAT (0.3-300 GeV), and S…
Limits to Quantum Gravity Effects from Observations of TeV Flares in Active Galaxies
S. D. Biller, A. C. Breslin, J. Buckley +21
We have used data from the TeV gamma-ray flare associated with the active galaxy Markarian 421 observed on 15 May 1996 to place bounds on the possible energy-dependence of the spee…
Extragalactic Sources of TeV Gamma Rays: A Summary
D. Horan, T. C. Weekes
The development of techniques whereby gamma rays of energy 100 GeV and above can be studied from the ground, using indirect, but sensitive, techniques has opened up a new area of h…
Veritas: Status c. 2009
T. C. Weekes, the VERITAS Collaboration
VERITAS is a ground-based gamma-ray observatory that uses the imaging atmospheric Cherenkov technique and operates in the very high-energy (VHE) region of the gamma- ray spectrum f…
VERITAS Observations of the Nova in V407 Cygni
E. Aliu, S. Archambault, T. Arlen +92
We report on very high energy (E > 100 GeV) gamma-ray observations of V407 Cygni, a symbiotic binary that underwent a nova outburst producing 0.1-10 GeV gamma rays during 2010 Marc…
Whipple Observations of BL Lac Objects
M. D'Vali, I. H. Bond, S. M. Bradbury +23
Only BL Lac objects have been detected as extragalactic sources of very high energy (E > 300 GeV) gamma rays. Using the Whipple Observatory Gamma-ray Telescope, we have attempted t…
Status of the VERITAS Observatory
J. Holder, V. A. Acciari, E. Aliu +79
VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma-ray astronomy in the GeV-TeV range, has recently completed its first season of observations with a full…
Discovery of Spectral Variability of Markarian 421 at TeV Energies
F. Krennrich, I. H. Bond, S. M. Bradbury +38
The detection of spectral variability of the gamma-ray blazar Mrk 421 at TeV energies is reported. Observations with the Whipple Observatory 10m gamma-ray telescope taken in 2000/2…
TeV and Multi-wavelength Observations of Mrk 421 in 2006-2008
V. A. Acciari, E. Aliu, T. Arlen +103
We report on TeV gamma-ray observations of the blazar Mrk 421 (redshift of 0.031) with the VERITAS observatory and the Whipple 10m Cherenkov telescope. The excellent sensitivity of…
Very High Energy Observations of PSR B1951+32
R. Srinivasan, P. J. Boyle, J. H. Buckley +24
PSR B1951+32 is a gamma-ray pulsar detected by the Energetic Gamma Ray Experiment Telescope (EGRET) and identified with the 39.5 ms radio pulsar in the supernova remnant CTB 80. Th…
TeV Gamma-ray Observations and the Origin of Cosmic Rays: I
T. C. Weekes
This is the first of three plenary talks with the same title given at the 28th ICRC in Tsukuba, Japan in August, 2003. A brief description of the techniques for detecting gamma ray…
Multiwavelength Observations of 1ES 1959+650, One Year After the Strong Outburst of 2002
K. Gutierrez, H. M. Badran, S. M. Bradbury +33
In April-May 2003, the blazar 1ES 1959+650 showed an increased level of X-ray activity. This prompted a multiwavelength observation campaign with the Whipple 10 m gamma-ray telesco…
VERITAS Observations of a Very High Energy Gamma-ray Flare from the Blazar 3C 66A
VERITAS Collaboration, V. A. Acciari, E. Aliu +87
The intermediate-frequency peaked BL Lacertae (IBL) object 3C 66A is detected during 2007 - 2008 in VHE (very high energy: E > 100 GeV) gamma-rays with the VERITAS stereoscopic arr…
The TeV spectrum of H1426+428
D. Petry, I. H. Bond, S. M. Bradbury +45
The BL Lac object H1426+428 was recently detected as a high energy gamma-ray source by the VERITAS collaboration (Horan et al. 2002). We have reanalyzed the 2001 portion of the dat…
A Three-Year Multi-Wavelength Study of the Very High Energy Gamma-ray Blazar 1ES 0229+200
E. Aliu, S. Archambault, T. Arlen +83
The high-frequency-peaked BL Lacertae object 1ES 0229+200 is a relatively distant (z = 0.1396), hard-spectrum (Gamma ~ 2.5), very-high-energy-emitting (E > 100 GeV) gamma-ray blaza…
VERITAS Observations of Gamma-Ray Bursts Detected by Swift
VERITAS Collaboration, V. A. Acciari, E. Aliu +84
We present the results of sixteen Swift-triggered GRB follow-up observations taken with the VERITAS telescope array from January, 2007 to June, 2009. The median energy threshold an…
Very high energy gamma rays from Markarian 501
R. J. Protheroe, C. L. Bhat, P. Fleury +3
During remarkable flaring activity in 1997 Markarian 501 was the brightest source in the sky at TeV energies, outshining the Crab Nebula by a factor of up to 10. Periods of flaring…
A search for correlations of TeV gamma-rays with ultra-high energy cosmic rays
C. W. Akerlof, S. Biller, P. Boyle +25
A search was conducted for TeV gamma-rays emitted from the direction of the ultra-high energy cosmic ray detected by the Fly's Eye Experiment with E ~ 3 x 10**20 eV. No enhancement…
VERITAS contributions to the 33rd International Cosmic Ray Conference
VERITAS Collaboration, E. Aliu, S. Archambault +86
Compilation of papers contributed by the VERITAS Collaboration to the 33rd International Cosmic Ray Conference, held 2-9 July, 2013, in Rio de Janeiro, Brazil.
A search for enhanced very high energy gamma-ray emission from the March 2013 Crab Nebula flare
The VERITAS Collaboration, E. Aliu, S. Archambault +76
In March 2013, a flaring episode from the Crab Nebula lasting ~2 weeks was detected by the Fermi-LAT (Large Area Telescope on board the Fermi Gamma-ray Space Telescope). VERITAS pr…
VERITAS Search for VHE Gamma-ray Emission from Dwarf Spheroidal Galaxies
The VERITAS Collaboration, V. A. Acciari, T. Arlen +73
Indirect dark matter searches with ground-based gamma-ray observatories provide an alternative for identifying the particle nature of dark matter that is complementary to that of d…
A Search for Dark Matter Annihilation with the Whipple 10m Telescope
M. Wood, G. Blaylock, S. M. Bradbury +33
We present observations of the dwarf galaxies Draco and Ursa Minor, the local group galaxies M32 and M33, and the globular cluster M15 conducted with the Whipple 10m gamma-ray tele…
Correlated variability of Mkn 421 at X-ray and TeV wavelengths on timescales of hours
L. Maraschi, G. Fossati, F. Tavecchio +26
Mkn 421 was observed for about two days with BeppoSAX, prior to and partly overlapping the start of a 1 week continuous exposure with ASCA in April 1998, as part of a world-wide mu…
Observation of Markarian 421 in TeV gamma rays over a 14-year time span
V. A. Acciari, T. Arlen, T. Aune +73
The variability of the blazar Markarian 421 in TeV gamma rays over a 14-year time period has been explored with the Whipple 10 m telescope. It is shown that the dynamic range of it…
Multiwavelength Observations of the Previously Unidentified Blazar RX J0648.7+1516
E. Aliu, T. Aune, M. Beilicke +84
We report on the VERITAS discovery of very-high-energy (VHE) gamma- ray emission above 200 GeV from the high-frequency-peaked BL Lac object RXJ0648.7+1516 (GBJ0648+1516), associate…
Search for Primordial Black Holes with SGARFACE
M. Schroedter, F. Krennrich, S. LeBohec +7
The Short GAmma Ray Front Air Cherenkov Experiment (SGARFACE) uses the Whipple 10 m telescope to search for bursts of rays. SGARFACE is sensitive to bursts with duration from…
Multiwavelength observations of a TeV-Flare from W Comae
VERITAS collaboration, V. A. Acciari, E. Aliu +167
We report results from an intensive multiwavelength campaign on the intermediate-frequency-peaked BL Lacertae object W Com (z=0.102) during a strong outburst of very high energy ga…
Spectral Energy Distribution of Markarian 501: Quiescent State vs. Extreme Outburst
The VERITAS Collaboration, V. A. Acciari, T. Arlen +225
The very high energy (VHE; E > 100 GeV) blazar Markarian 501 has a well-studied history of extreme spectral variability and is an excellent laboratory for studying the physical pro…
Multiwavelength Observations of LS I +61 303 with VERITAS, Swift and RXTE
VERITAS Collaboration, V. A. Acciari, E. Aliu +83
We present results from a long-term monitoring campaign on the TeV binary LSI +61 303 with VERITAS at energies above 500 GeV, and in the 2-10 keV hard X-ray bands with RXTE and Swi…
Detection Techniques of Microsecond Gamma-Ray Bursts using Ground-Based Telescopes
F. Krennrich, S. Le Bohec, T. C. Weekes
Gamma-ray observations above 200 MeV are conventionally made by satellite-based detectors. The EGRET detector on the Compton Gamma Ray Observatory (CGRO) has provided good sensitiv…
High Energy Astrophysics
T. C. Weekes
The development of the atmospheric Cherenkov imaging technique has led to significant advances in gamma-ray detection sensitivity in the energy range from 200 GeV to 50 TeV. The Wh…
Observations of the shell-type SNR Cassiopeia A at TeV energies with VERITAS
The VERITAS Collaboration, V. A. Acciari, E. Aliu +80
We report on observations of very high-energy gamma rays from the shell-type supernova remnant Cassiopeia A with the VERITAS stereoscopic array of four imaging atmospheric Cherenko…
VERITAS Observations of the TeV Binary LS I +61 303 During 2008-2010
V. A. Acciari, E. Aliu, T. Arlen +83
We present the results of observations of the TeV binary LS I +61 303 with the VERITAS telescope array between 2008 and 2010, at energies above 300 GeV. In the past, both ground-ba…
Search for TeV Counterparts in Gamma-Ray Bursts
P. J. Boyle, J. H. Buckley, A. M. Burdett +25
Based on BACODINE network notification the Whipple Observatory gamma-ray telescope has been used to search for the delayed TeV counterpart to BATSE-detected gamma-ray bursts. In th…
VERITAS: the Very Energetic Radiation Imaging Telescope Array System
T. C. Weekes
The Very Energetic Radiation Imaging Telescope Array System (VERITAS) represents an important step forward in the study of extreme astrophysical processes in the universe. It combi…