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dc.contributor.authorGothe, K. S-
dc.contributor.authorPrabhu, T. P-
dc.contributor.authorVishwanath, P. R-
dc.contributor.authorAcharya, B. S-
dc.contributor.authorSrinivasan, R-
dc.contributor.authorChitnis, V. R-
dc.contributor.authorKamath, P. U-
dc.contributor.authorSrinivasulu, G-
dc.contributor.authorSaleem, F-
dc.contributor.authorKemkar, P. M. M-
dc.contributor.authorMahesh, P. K-
dc.contributor.authorGabriel, F-
dc.contributor.authorManoharan, J-
dc.contributor.authorDorji, N-
dc.contributor.authorDorjai, T-
dc.contributor.authorAngchuk, D-
dc.contributor.authorD'souza, A. I-
dc.contributor.authorDuhan, S. K-
dc.contributor.authorNagesh, B. K-
dc.contributor.authorRao, S. K-
dc.contributor.authorSharma, S. K-
dc.contributor.authorSingh, B. B-
dc.contributor.authorSudersanan, P. V-
dc.contributor.authorThsering, M. T-
dc.contributor.authorUpadhya, S. S-
dc.contributor.authorAnupama, G. C-
dc.contributor.authorBritto, R. J-
dc.contributor.authorCowsik, R-
dc.contributor.authorSaha, L-
dc.contributor.authorShukla, A-
dc.identifier.citationExperimental Astronomy, Vol. 35, No. 3, pp. 489-506en
dc.descriptionRestricted Accessen
dc.descriptionThe original publication is available at
dc.description.abstractAn array of seven atmospheric Cherenkov telescopes was commissioned at a high altitude site in Hanle in the Ladakh region of the Himalayas. The array called HAGAR has been designed to observe celestial γ-rays of energy >100 GeV. Each telescope is altitude-azimuth mounted and carries seven parabolic mirrors whose optic axes are co-aligned with the telescope axis. The telescopes point and track a celestial source using a PC-based drive control system. Two important issues in positioning of each HAGAR telescope are pointing accuracy of telescope axis and co-alignment of mirrors’ optic axes with the telescope axis. We have adopted a three pronged strategy to address these issues, namely use of pointing models to improve pointing accuracy of the telescopes, RA-DEC scan technique to measure the pointing offsets of the mirrors and mechanical fine-tuning of off-axis mirrors by sighting a distant stationary light source. This paper discusses our efforts in this regard as well as the current status of pointing and monitoring of HAGAR telescopes.en
dc.rights© Springeren
dc.subjectTelescope pointingen
dc.subjectγ-ray astronomyen
dc.subjectPointing modelen
dc.subjectAtmospheric Cherenkov telescopesen
dc.titlePointing of HAGAR telescope mirrorsen
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