Now showing items 1-10 of 10

    • Cutoff in the t[clc]e[/clc]v energy spectrum of markarian 421 during strong flares in 2001 

      Krennrich, F.; Badran, H. M.; Bond, I. H.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D. A.; Catanese, M.; Cui, W.; Dunlea, S.; Das, D.; de la Calle Perez, I.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Gaidos, J. A.; Gibbs, K.; Gillanders, G. H.; Hall, T. A.; Hillas, A. M.; Holder, J.; Horan, D.; Jordan, M.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Kosack, K.; Lang, M. J.; LeBohec, S.; McKernan, B.; Moriarty, P.; Müller, D.; Ong, R.; Pallassini, R.; Petry, D.; Quinn, J.; Reay, N. W.; Reynolds, P. T.; Rose, H. J.; Sembroski, G. H.; Sidwell, R.; Stanton, N.; Swordy, S. P.; Vassiliev, V. V.; Wakely, S. P.; Weekes, T. C. (IOP Publishing, 2001-10-10)
      Exceptionally strong and long- lasting flaring activity of the blazar Mrk 421 occurred between 2001 January and March. Based on the excellent signal- to- noise ratio of the data, we derive the energy spectrum between 260 ...
    • Detection of t[clc]e[/clc]v gamma rays from the bl lacertae object 1es 1959+650 with the whipple 10 meter telescope 

      Holder, J.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D. A.; Cui, W.; Dowdall, C.; Duke, C.; de la Calle Perez, I.; Falcone, A.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Fortson, L.; Gaidos, J. A.; Gibbs, K.; Gammell, S.; Hall, J.; Hall, T. A.; Hillas, A. M.; Horan, D.; Jordan, M.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Kosack, K.; Krawczynski, H.; Krennrich, F.; LeBohec, S.; Linton, E. T.; Lloyd-Evans, J.; Moriarty, P.; Müller, D.; Nagai, T. N.; Ong, R.; Page, M.; Pallassini, R.; Petry, D.; Power-Mooney, B.; Quinn, J.; Rebillot, P.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Swordy, S. P.; Vassiliev, V. V.; Wakely, S. P.; Walker, G.; Weekes, T. C. (IOP Publishing, 2003-01-20)
      We present the first strong detection of very high energy gamma-rays from the close (z=0.048) X-ray-selected BL Lacertae object 1ES 1959+650. Observations were made with the Whipple 10 m telescope on Mount Hopkins, Arizona, ...
    • Discovery of spectral variability of markarian 421 at t[clc]e[/clc]v energies 

      Krennrich, F.; Bond, I. H.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D. A.; Cui, W.; de la Calle Perez, I.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Gaidos, J. A.; Gibbs, K.; Gillanders, G. H.; Hall, T. A.; Hillas, A. M.; Holder, J.; Horan, D.; Jordan, M.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Kosack, K.; Lang, M. J.; LeBohec, S.; Moriarty, P.; Müller, D.; Ong, R. A.; Pallassini, R.; Petry, D.; Quinn, J.; Reay, N. W.; Reynolds, P. T.; Rose, H. J.; Sembroski, G. H.; Sidwell, R.; Stanton, N.; Swordy, S. P.; Vassiliev, V. V.; Wakely, S. P.; Weekes, T. C. (IOP Publishing, 2002-08-10)
      The detection of spectral variability of the gamma-ray blazar Mrk 421 at TeV energies is reported. Observations with the Whipple Observatory 10 m gamma-ray telescope taken in 2000/2001 revealed exceptionally strong and ...
    • Evidence for tev gamma ray emission from tev j2032+4130 in whipple archival data 

      Lang, M. J.; Carter-Lewis, D. A.; Fegan, D. J.; Fegan, S. J.; Hillas, A. M.; Lamb, R. C.; Punch, M.; Reynolds, P. T.; Weekes, T. C. (EDP Sciences, 2004-08-01)
      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 reported by the Crimean Astrophysical ...
    • Limits to quantum gravity effects on energy dependence of the speed of light from observations of tev flares in active galaxies 

      Biller, S. D.; Breslin, A. C.; Buckley, J.; Catanese, M.; Carson, M.; Carter-Lewis, D. A.; Cawley, M. F.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Hillas, A. M.; Krennrich, F.; Lamb, R. C.; Lessard, R.; Masterson, C.; McEnery, J. E.; McKernan, B.; Moriarty, P.; Quinn, J.; Rose, H. J.; Samuelson, F.; Sembroski, G.; Skelton, P.; Weekes, T. C. (American Physical Society (APS), 1999-09-13)
      We have used data from a TeV gamma-ray flare associated with the active galaxy Markarian 421 to place bounds on the possible energy dependence of the speed of light in the context of an effective quantum gravitational ...
    • Multiwavelength observations of a flare from markarian 501 

      Catanese, M.; Bradbury, S. M.; Breslin, A. C.; Buckley, J. H.; Carter-Lewis, D. A.; Cawley, M. F.; Dermer, C. D.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Hillas, A. M.; Johnson, W. N.; Krennrich, F.; Lamb, R. C.; Lessard, R. W.; Macomb, D. J.; McEnery, J. E.; Moriarty, P.; Quinn, J.; Rodgers, A. J.; Rose, H. J.; Samuelson, F. W.; Sembroski, G. H.; Srinivasan, R.; Weekes, T. C.; Zweerink, J. (IOP Publishing, 1997-10-01)
      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 high energy (VHE; E greater than or similar ...
    • 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; 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 ...
    • Simultaneous x-ray and t[clc]e[/clc]v observations of a rapid flare from markarian 421 

      Maraschi, L.; Fossati, G.; Tavecchio, F.; Chiappetti, L.; Celotti, A.; Ghisellini, G.; Grandi, P.; Pian, E.; Tagliaferri, G.; Treves, A.; Breslin, A. C.; Buckley, J. H.; Carter-Lewis, D. A.; Catanese, M.; Cawley, M. F.; Fegan, D. J.; Fegan, S.; Finley, J.; Gaidos, J.; Hall, T.; Hillas, A. M.; Krennrich, F.; Lessard, R. W.; Masterson, C.; Moriarty, P.; Quinn, J.; Rose, J.; Samuelson, F.; Weekes, T. C.; Urry, C. M.; Takahashi, T. (IOP Publishing, 1999-12-01)
      Mrk 421 was observed for about 2 days with BeppoSAX in 1998 April as part of a worldwide multiwavelength campaign. A large, well-defined flare was observed in X-rays. The same flare was observed simultaneously at TeV ...
    • Tev gamma-ray observations of the galactic center 

      Kosack, K.; Badran, H. M.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D. A.; Celik, O.; Connaughton, V.; Cui, W.; Daniel, M.; D'Vali, M.; de la Calle Perez, I.; Duke, C.; Falcone, A.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Fortson, L. F.; Gaidos, J. A.; Gammell, S.; Gibbs, K.; Gillanders, G. H.; Grube, J.; Gutierrez, K.; Hall, J.; Hall, T. A.; Hanna, D.; Hillas, A. M.; Holder, J.; Horan, D.; Jarvis, A.; Jordan, M.; Kenny, G. E.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; Le Bohec, S.; Linton, E.; Lloyd-Evans, J.; Milovanovic, A.; McEnery, J.; Moriarty, P.; Muller, D.; Nagai, T.; Nolan, S.; Ong, R. A.; Pallassini, R.; Petry, D.; Power-Mooney, B.; Quinn, J.; Quinn, M.; Ragan, K.; Rebillot, P.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Swordy, S. P.; Syson, A.; Vassiliev, V. V.; Wakely, S. P.; Walker, G.; Weekes, T. C.; Zweerink, J. (IOP Publishing, 2004-05-18)
      We report a possible detection of TeV gamma rays from the Galactic center by the Whipple 10 m gamma-ray telescope. Twenty-six hours of data were taken over an extended period from 1995 through 2003 resulting in a total ...