Now showing items 21-40 of 56

  • Multiwavelength observations of a TeV-Flare from W Comae 

    Lang, Mark; Gillanders, Gary (2009)
    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 gamma-ray emission in June 2008. The very ...
  • Multiwavelength Observations of LS I +61 303 with VERITAS, Swift and RXTE 

    Lang, Mark; Gillanders, Gary (2009)
    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 Swift, sampling nine 26.5 day orbital cycles ...
  • Multiwavelength Observations of Markarian 421 in 2005 - 2006 

    Lang, Mark; Gillanders, Gary (2009)
    Since September 2005, the Whipple 10m Gamma-ray Telescope has been operated primarily as a blazar monitor. The five Northern Hemisphere blazars that have already been detected at the Whipple Observatory, Markarian 421, ...
  • Multiwavelength observations of Mrk 501 in 2008 

    Gillanders, Gary; Lang, Mark (EDP Sciences, 2015-12-17)
    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 ...
  • Multiwavelength Observations of the Previously Unidentified Blazar RX J0648.7+1516 

    Gillanders, Gary (2011)
    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), associated with 1FGLJ0648.8+1516. The photon spectrum ...
  • Multiwavelength Observations of the VHE Blazar 1ES 2344+514 

    Lang, Mark; Gillanders, Gary (2011)
    Multiwavelength observations of the high-frequency-peaked blazar 1ES2344+514 were performed from 2007 October to 2008 January. The campaign represents the first contemporaneous data on the object at very high energy (VHE, ...
  • Observation of Extended VHE Emission from the Supernova Remnant IC 443 with VERITAS 

    Lang, Mark; Gillanders, Gary (2009)
    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-studied sites of supernova remnant/molecular ...
  • Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS 

    Lang, Mark; Gillanders, Gary (2008)
    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 TeV gamma-rays. Here we report the detection ...
  • Observations of the shell-type SNR Cassiopeia A at TeV energies with VERITAS 

    Lang, Mark; Gillanders, Gary (2010)
    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 Cherenkov telescopes in Arizona. The total exposure ...
  • Observations of the Unidentified TeV Gamma-Ray Source TeV J2032+4130 with the Whipple Observatory 10 m Telescope 

    Lang, Mark; Gillanders, Gary (2006)
    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 telescope for a total of 65.5 hrs between 2003 and ...
  • Recent Results from the VERITAS Collaboration 

    Lang, Mark; Gillanders, Gary (2002)
    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; Petry et al. 1996; Piron et al. 2001), ...
  • A search for brief optical flashes associated with the SETI target KIC 8462852 

    Gillanders, Gary; Lang, Mark (IOP Publishing, 2016-02-18)
    The F-type star KIC. 8462852 has recently been identified as an exceptional target for search for extraterrestrial intelligence (SETI) observations. We describe an analysis methodology for optical SETI, which we have used ...
  • A search for pulsations from Geminga above 100 GeV with VERITAS 

    Connolly, M.P.; Gillanders, Gary; Moriarty, P.; Lang, Mark (American Astronomical Society, 2015-02-10)
    We present the results of 71.6 hr of observations of the Geminga pulsar (PSR J0633+1746) with the VERITAS very-high-energy gamma-ray telescope array. Data taken with VERITAS between 2007 November and 2013 February were ...
  • A Search for Pulsed TeV Gamma Ray Emission from the Crab Pulsar 

    Lang, Mark; Gillanders, Gary (1999)
    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 observed for a total of 73.4 hours between 1994 ...
  • A Search for Pulsed TeV Gamma Ray Emission from the Crab Pulsar 

    Lang, Mark; Gillanders, Gary; Burdett, A. M.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D. A.; Catanese, M.; Cawley, M. F.; D'Vali, M.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Gaidos, J. A.; Gillanders, G. H.; Hall, T. A.; Hillas, A. M.; Kildea, J.; Knapp, J.; Krennrich, F.; Lang, M. J.; LeBohec, S.; Lessard, R. W.; Masterson, C.; Moriarty, P.; Quinn, J.; Rose, H. J.; Samuelson, F. W.; Sembroski, G. H.; Srinivasan, R.; Vassiliev, V. V.; Weekes, T. C. (1999)
    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 observed for a total of 73.4 hours between 1994 ...
  • Search for Pulsed TeV Gamma-ray Emission from the Crab Pulsar 

    Lang, Mark; Gillanders, Gary (1999)
    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 observed for a total of 73.4 hours between 1994 ...
  • Search for Pulsed TeV Gamma-ray Emission from the Crab Pulsar 

    Lang, Mark; Gillanders, Gary; Lessard, R. W.; Bond, I. H.; Bradbury, S. M.; Buckley, J. H.; Burdett, A. M.; Carter-Lewis, D. A.; Catanese, M.; Cawley, M. F.; D'Vali, M.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Gillanders, G. H.; Hall, T.; Hillas, A. M.; Krennrich, F.; Lang, M. J.; Masterson, C.; Moriarty, P.; Quinn, J.; Rose, H. J.; Samuelson, F. W.; Sembroski, G. H.; Srinivasan, R.; Vassiliev, V. V.; Weekes, T. C. (1999)
    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 observed for a total of 73.4 hours between 1994 ...
  • Status of the VERITAS Observatory 

    Lang, Mark; Gillanders, Gary (2008)
    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 array of four telescopes. A number of ...
  • TeV and Multi-wavelength Observations of Mrk 421 in 2006-2008 

    Lang, Mark; Gillanders, Gary (2011)
    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 VERITAS allowed us to sample the TeV ...
  • TeV Gamma-Ray Observations of the Perseus and Abell 2029 Galaxy Clusters 

    Lang, Mark; Gillanders, Gary (2006)
    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 galactic nuclei. Furthermore, gamma rays may ...