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Your search keyword '"Horan, D."' showing total 3 results
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3 results on '"Horan, D."'

1. Whipple telescope observations of LS I +61 303: 2004-2006.

Author

Paredes, Josep M., Reimer, Olaf, Torres, Diego F., Smith, A., Atkins, R. W., Bradbury, S., Celik, O., Chow, Y. C. K., Cogan, P., Dowdall, C., Fegan, S. J., Fortin, P., Gall, D., Gillanders, G. H., Grube, J., Gutierrez, K. J., Hall, T. A., Hanna, D., Holder, J., and Horan, D.

Subjects
TELESCOPES, ASTRONOMICAL instruments, ASTRONOMY, METAPHYSICAL cosmology, SPACE sciences
Abstract

In this paper we present the results of the past two years observations on the galactic microquasar LS I +61 303 with the Whipple 10 m gamma-ray telescope. The recent MAGIC detection of the source between 200 GeV and 4 TeV suggests that the source is periodic with very high energy (VHE) gamma-ray emission linked to its orbital cycle. The entire 50-hour data set obtained with Whipple from 2004 to 2006 was analyzed with no reliable detection resulting. The upper limits obtained in the 2005-2006 season covered several of the same epochs as the MAGIC Telescope detections, albeit with lower sensitivity. Upper limits are placed on emission during the orbital phases of 0→0.1 and 0.8→1, phases which are not included in the MAGIC data set. [ABSTRACT FROM AUTHOR]

Published
2007
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2. Very High Energy Observations of Gamma Ray Bursts with the Whipple/VERITAS Telescopes.

Author

Horan, D., Badran, H. M., Blaylock, G., Bond, I. H., Boyle, P. J., Bradbury, S. M., Buckley, J. H., Byrum, K., Carter-Lewis, D. A., Celik, O., Cogan, P., Cui, W., Daniel, M. K., de la Calle Perez, I., Duke, C., Falcone, A., Fegan, D. J., Fegan, S. J., Finley, J. P., and Fortson, L. F.

Subjects
*GAMMA rays, *ELECTROMAGNETIC waves, *GAMMA ray astronomy, *EMISSIONS (Air pollution), *TELESCOPES, *ASTRONOMICAL instruments
Abstract

Gamma-ray Burst (GRB) observations at Very High Energies (VHE, E > 100 GeV) can impose tight constraints on some GRB emission models. Many GRB after-glow models predict a VHE component similar to that seen in blazars and supernova remnants, in which the GRB spectral energy distribution has a double-peaked shape extending into the VHE regime. Consistent with this afterglow scenario, EGRET detected delayed high energy emission from all five bright BATSE GRBs that occurred within its field of view. GRB observations have had high priority in the observing program at the Whipple 10m Telescope and will continue to be high priority targets when the next generation observatory VERITAS comes online. Upper limits on the VHE emission from ten GRBs observed with the Whipple Telescope are reported here. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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3. VHE observations of BL Lacertae objects: 1995–2000

Author

Horan, D.

Subjects
*BL Lacertae objects, *ASTRONOMICAL observatories, *TELESCOPES, *ASTRONOMICAL instruments, *ACTIVE galaxies
Abstract

Over the past eight years, observations of BL Lacertae type objects have been an important part of the observing program at the Whipple Observatory 10 m γ-ray telescope. During this time, TeV emission was detected from five such objects: Markarian 421, Markarian 501, 1ES2344+514, H1426+428 and 1ES1959+650. Upper limits were placed on the TeV emission from 29 other BL Lacertae objects. Among these objects are two unconfirmed TeV sources, 3C66A and BL Lacertae. An overview of the results of these observations of BL Lacertae objects, between 1995 and 2000, at the Whipple Observatory is presented here. [Copyright &y& Elsevier]

Published
2004
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