Stellar Intensity Interferometry with Air Cherenkov Telescope arrays (2007)
Bohec, S. Le, Daniel, M., De Wit, W. J., Hinton, J. A., Jose, E., Holder, J. A., ...
The present generation of ground-based Very High Energy (VHE) gamma-ray observatories consist of arrays of up to four large (> 12m diameter) light collectors quite similar to those used by R. Hanbury...
The potential for intensity interferometry with gamma-ray telescope arrays (2007)
De Wit, W. J., Bohec, S. Le, Hinton, J. A., White, J., Daniel, M. K., ...
Intensity interferometry exploits a quantum optical effect in order to measure objects with extremely small angular scales. The first experiment to use this technique was the Narrabri intensity...
Multiwavelength Observations of 1ES 1959+650, One Year After the Strong Outburst of 2002 (2007)
Gutierrez, K., Badran, H. M., Bradbury, S. M., Buckley, J. H., Celik, O., Chow, Y. C., ...
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 telescope, the Rossi X-ray...
Optical Intensity Interferometry with Atmospheric Cherenkov Telescope Arrays (2006)
In the 1970s, the Narrabri intensity interferometer was used to measure 32 stellar diameters; some as small as 0.4 milli-arc-seconds (mas). The interferometer consisted of a pair of 6.5m telescopes...
Krawczynski, H., Carter-Lewis, D. A., Duke, C., Holder, J., Maier, G., Bohec, S. Le, ...
Ground-based arrays of imaging atmospheric Cherenkov telescopes have emerged as the most sensitive gamma-ray detectors in the energy range of about 100 GeV and above. The strengths of these arrays...
Multiwavelength Observations of 1ES 1959+650, One Year After the Strong Outburst of 2002 (2006)
Gutierrez, K., Badran, H. M., Bradbury, S. M., Buckley, J. H., Celik, O., Chow, Y. C., ...
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 telescope, the Rossi X-ray...
Multiwavelength Observations of 1ES 1959+650, One Year After the Strong Outburst of 2002 (2006)
Gutierrez, K., Badran, H. M., Bradbury, S. M., Buckley, J. H., Celik, O., Chow, Y. C., ...
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 telescope, the Rossi X-ray...
Multiwavelength Observations of 1ES 1959+650, One Year After the Strong Outburst of 2002 (2006)
Gutierrez, K., Badran, H. M., Bradbury, S. M., Buckley, J. H., Celik, O., Chow, Y. C., ...
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 telescope, the Rossi X-ray...
Lessard, R. W., Buckley, J. H., Connaughton, V., Bohec, S. Le
We present a method of atmospheric Cherenkov imaging which reconstructs the unique arrival direction of TeV gamma rays using a single telescope. The method is derived empirically and utilizes several...
Detection Techniques of Microsecond Gamma-Ray Bursts using Ground-Based Telescopes (1999)
Krennrich, F., Bohec, S. Le, Weekes, T. C.
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 sensitivity for the...
Whipple Observations of BL Lac Objects (1999)
D'Vali, M., Bond, I. H., Bradbury, S. M., Buckley, J. H., Burdett, A. M., Carter-Lewis, D. A., ...
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 to detect more BL...
Hour-Scale Multiwavelength Variability in Markarian 421 (1999)
Catanese, M., Bond, I. H., Bradbury, S. M., Breslin, A. C., Buckley, J. H., Burdett, A. M., ...
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 variability was observed...
Search for TeV Gamma-Rays from Shell-Type Supernova Remnants (1999)
Bond, I. H., Boyle, P. J., Bradbury, S. M., Buckley, J. H., Burdett, A. M., ...
If cosmic rays with energies 500 GeV flux are reported. Non-thermal X-ray emission detected from one of these remnants (Cassiopeia A) has been interpreted as synchrotron emission from electrons in...
Djannati-Atai, A., Piron, F., Barrau, A., Iacoucci, L., Punch, M., ...
The BL Lac object Mrk 501 went into a very high state of activity during 1997, both in VHE gamma-rays and X-rays. We present here results from observations at energies above 250 GeV carried out...
Present status of the 7-10 m telescope of CANGAROO II (1999)
Yoshikoshi, T., Dazeley, S. A., Gunji, S., Hara, S., Hara, T., Holder, J., ...
The Cherenkov telescope of the CANGAROO II project will start operation in 1999 in Woomera, South Australia, with a 7 m aperture using 60 plastic mirrors. The telescope, which can potentially be...
Present status of the 7-10 m telescope of CANGAROO II (1999)
Yoshikoshi, T., Dazeley, S. A., Gunji, S., Hara, S., Hara, T., Holder, J., ...
The Cherenkov telescope of the CANGAROO II project will start operation in 1999 in Woomera, South Australia, with a 7 m aperture using 60 plastic mirrors. The telescope, which can potentially be...
Present Status of the 7/10 m Telescope of CANGAROO II (1998)
T. Yoshikoshi, S. A. Dazeley, S. Gunji, S. Hara, T. Hara, J. Holder, ...
A 7/10 m diameter Cerenkov telescope of the CANGAROO II project will start operation in 1999 in Woomera, South Australia, with a 7 m aperture using 60 plastic mirrors. The telescope aims to observe...
The CAT Imaging Telescope for Very-High-Energy Gamma-Ray Astronomy (1998)
A. Barrau, R. Bazer-bachi, E. Beyer, M. Cerutti, L. M. Chounet, G. Debiais, ...
The CAT (Cherenkov Array at Th'emis) imaging telescope, equipped with a veryhigh -definition camera (546 fast phototubes with 0:12 ffi spacing surrounded by 54 Preprint submitted to Elsevier Preprint...
S. Le Bohec, B. Degrange, M. Punch, A. Barrau, L. M. Chounet, G. Debiais, ...
A new method of shower-image analysis is presented which appears very powerful as applied to those Cherenkov Imaging Telescopes with very high definition imaging capability. It provides hadron...
Bohec, S. Le, Degrange, B., Punch, M., Barrau, A., Bazer-Bachi, R., Cabot, H., ...
A new method of shower-image analysis is presented which appears very powerful as applied to those Cherenkov Imaging Telescopes with very high definition imaging capability. It provides hadron...
The CAT Imaging Telescope for Very-High-Energy Gamma-Ray Astronomy (1998)
Barrau, A., Bazer-Bachi, R., Beyer, E., Cabot, H., Cerutti, M., Chounet, L. M., ...
The CAT (Cherenkov Array at Themis) imaging telescope, equipped with a very-high-definition camera (546 fast phototubes with 0.12 degrees spacing surrounded by 54 larger tubes in two guard rings)...
Spectrum and Variability of Mrk501 as observed by the CAT Imaging Telescope (1997)
Barrau, A., Bazer-Bachi, R., Cabot, H., Chounet, L. M., Debiais, G., Degrange, B., ...
The CAT Imaging Telescope has observed the BL Lac object Markarian 501 between March and August 1997. We report here on the variability over this time including several large flares. We present also...
Barrau, A., Bazer-Bachi, R., Cabot, H., Chounet, L. M., Debiais, G., Degrange, B., ...
The CAT imaging telesope, which uses the Atmospheric Cherenkov Technique to observe TeV gamma-ray sources, has been operating since September 1996. Located in southern France, it features a fine...
Detection Of Vhe Gamma-Rays From Mrk 501 With The Cat Imaging Telescope (1997)
A. Barrau, L. M. Chounet, G. Debiais, B. Degrange, D. Dumora, P. Espigat, ...
The CAT imaging telescope on the site on the former solar plant Th'emis has been observing fl-rays from Mrk501 above 220 GeV in March and April 1997. This source is shown to be highly variable and...
The CAT Imaging Telescope (1997)
Barrau, A., Bazer-Bachi, R., Cabot, H., Chounet, L. M., Debiais, G., Degrange, B., ...
The VHE gamma-ray imaging telescope CAT started taking data in October 1996. Located at the Themis solar site in southern France, it features a 17.7 m^2 Davies-Cotton mirror equipped with 600 PMT...
Barrau, A., Bazer-Bachi, R., Cabot, H., Chounet, L. M., Debiais, G., Degrange, B., ...
The CAT imaging telescope, recently built on the site of the former solar plant Themis (French Pyrenees), observed gamma-rays from the Crab nebula from October 1996 to March 1997. This steady source,...
Detection of Vhe Gamma-Rays from MRK 501 with the Cat Imaging Telescope (1997)
Barrau, A., Bazer-Bachi, R., Cabot, H., Chounet, L. M., Debiais, G., Degrange, B., ...
The CAT imaging telescope on the site on the former solar plant Themis has been observing gamma-rays from Mrk501 above 220 GeV in March and April 1997. This source is shown to be highly variable and...