Very high energy gamma-ray telescope at Gulmarg.

Details Very high energy gamma-ray telescope at Gulmarg. Very high energy gamma-ray telescope at Gulmarg.

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ijpap..27..355r&link_type=abstract

Indian J. Pure Appl. Phys., Vol. 27, No. 7/8, p. 355 - 365

Physics

6

Gamma-Ray Telescopes, Gamma-Ray Sources: Methods Of Observation

Scientific paper

An indigenously built gamma-ray telescope has been operating at Gulmarg for the last four years. Based on the atmospheric Cerenkov technique, it can detect cosmic photons of energy above 1012eV. The system employs six equatorially mounted parabolic mirrors each of 0.9 m aperture and viewed by a fast photomultiplier tube at its focus. The stepper motor-based drive system of the telescope provides a pointing/tracking accuracy of 0.5° in an effective field of view of 4° diameter. In addition to steady and transient gamma-ray emissions from cosmic sources, the experiment enables to meaningfully carry out periodicity searches from pulsar-like objects at time scales down to a few milliseconds. Already new and interesting insights have been obtained on the gamma-ray emission characteristics of several sources including Cygnus X-3, Geminga and AM Herculis.

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