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  1. No Access

    Article

    Development of the atmospheric Cherenkov imaging technique

    Following a brief history of the atmospheric Cherenkov imaging technique and a summary of the current status of the field, we describe some of the potential developments of the method over the next few years. ...

    M. F. Cawley in Il Nuovo Cimento C (1996)

  2. No Access

    Article

    Extremely rapid bursts of TeV photons from the active galaxy Markarian 421

    DISCRETE astronomical sources of photons in the TeV energy range are believed to be associated with regions in the relativistic outflow of particles and radiation from compact objects, such as neutron stars an...

    J. A. Gaidos, C. W. Akerlof, S. Biller, P. J. Boyle, A. C. Breslin, J. H. Buckley… in Nature (1996)

  3. No Access

    Article

    Instrumentation for very high energy gamma-ray astronomy

    Considerable progress has been made in the last half-decade in the field of very high energy (VHE) gamma-ray astronomy (photons with energies between 1011 and 1013 eV). The high background level due to the isotro...

    M. F. Cawley, T. C. Weekes in Experimental Astronomy (1995)

  4. No Access

    Article

    Detection of TeV photons from the active galaxy Markarian 421

    PHOTONS of TeV energy have been observed from a few sources in our Galaxy, notably the Crab Nebula1. We report here the detection of such photons from an extragalactic source, the giant elliptical galaxy Markaria...

    M. Punch, C. W. Akerlof, M. F. Cawley, M. Chantell, D. J. Fegan, S. Fennell… in Nature (1992)

  5. No Access

    Article

    A high resolution imaging detector for TeV gamma-ray astronomy

    Details are presented of an atmospheric Cherenkov telescope for use in very high energy gamma-ray astronomy which consists of a cluster of 109 close-packed photomultiplier tubes at the focus of a 10 meter opti...

    M. F. Cawley, D. J. Fegan, K. Harris, A. M. Hillas, P. W. Kwok… in Experimental Astronomy (1990)

  6. No Access

    Chapter

    Observation of TeV Gamma-rays from the Crab Nebula

    The Whipple Observatory 10 m Reflector operating as a 37-pixel camera has been used to observe the Crab Nebula in TeV gamma rays. Using gamma-ray image selection a detection is reported at the 9.0 sigma level;...

    P. W. Kwok, M. F. Cawley, D. J. Fegan… in Cosmic Gamma Rays, Neutrinos, and Related … (1989)

  7. No Access

    Chapter

    Search for Pulsed TeV Emission from PSR0531+21

    The Crab pulsar (PSR0531+21) has been observed with the Whipple Observatory 10 m Reflector in imaging mode for ~102h. A suggestion of a broad light curve has been found, but with a low statistical significance...

    G. Vacanti, M. F. Cawley, D. J. Fegan… in Cosmic Gamma Rays, Neutrinos, and Related … (1989)

  8. No Access

    Chapter

    Observation of TeV Gamma-rays from the Crab Nebula and PSR 0531

    The Whipple Observatory 10 m Reflector operating as a 37-pixel camera has been used to observe the Crab Nebula in TeV gamma rays. Using gamma-ray image selection a detection is reported at the 9.0 sigma level;...

    P. W. Kwok, M. F. Cawley, D. J. Fegan, K. G. Gibbs, A. M. Hillas… in Timing Neutron Stars (1989)

  9. No Access

    Chapter

    Pulsed TeV Gamma Rays from 4u0115+63

    The transient X-ray binary pulsar, 4U0115+63, has been observed for 37 hours by the Whipple Observatory Cherenkov imaging camera between September 1985 and January 1986. These observations were grouped into ni...

    R. C. Lamb, M. F. Cawley, D. J. Fegan, K. G. Gibbs… in Very High Energy Gamma Ray Astronomy (1987)

  10. No Access

    Chapter

    TeV Observations of Her X-l at the Whipple Observatory: 1984–1985

    Her X-l has been observed for 73 hours with the Whipple Observatory Cerenkov imaging camera on the 10m reflector between April 1984 and June 1985. Seven distinct episodes of emission were seen, ranging in dura...

    P. W. Gorham, M. F. Cawley, D. J. Fegan… in Very High Energy Gamma Ray Astronomy (1987)

  11. No Access

    Chapter

    Search for TeV Gamma rays from the Galactic Plane near Cygnus X-3

    The null results of a search for gamma-ray emission at TeV energies from the galactic plane near Cygnus X-3 are reported.

    P. T. Reynolds, M. F. Cawley, D. J. Fegan… in Very High Energy Gamma Ray Astronomy (1987)

  12. No Access

    Chapter

    Search for a 12.59 ms. Pulsar in Cygnus X-3 at E > 400 GeV

    A high energy (E > 400 GeV) gamma ray database on Cygnus X-3 covering the observational interval 1983–1985 has been examined for possible evidence of a 12.5908 ms. pulsar, as recently reported by Chadwick et a...

    D. J. Fegan, M. F. Cawley, K. Gibbs, P. W. Gorham… in Very High Energy Gamma Ray Astronomy (1987)