JavaScript is disabled for your browser. Some features of this site may not work without it.
Gamma-ray source observations with the HAGAR telescope system at Hanle in the Himalayas
Britto, R. J; Acharya, B. S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Mahesh, P. K; Nagesh, B. K; Naidu, A; Parmar, N. K; Prabhu, T. P; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tsewang, D; Upadhya, S. S; Vishwanath, P. R
We have observed Crab nebula using the recently commissioned wavefront sampling high alti-
tude (4270 m) array, HAGAR, at Hanle in the Ladakh region of the Himalayas. Regular source observations
have begun with the complete setup of 7 telescopes since Sept. 2008. HAGAR is the first array of atmo-
spheric Cherenkov telescopes established at a so high altitude and was designed to reach a relatively low
threshold with quite a low mirror area (31 m
2). Estimation of the sensitivity of the experiment is undergoing
using several hours of data from the direction of Crab nebula, the standard candle source of TeV gamma-ray
astronomy. Data were acquired using the On-source/Off-source mode and by comparing these sky regions
the strength of the gamma-ray signal could be estimated. Gamma-ray events arrive close to telescope axis
direction while the cosmic-ray background events arrive from the whole field of view. We discuss our anal-
ysis procedures for the estimate of arrival direction, estimate of gamma-ray flux from Crab nebula and the
sensitivity of the HAGAR system etc in this paper. Also preliminary results on blazars 1es2344+514 and
Mkn421 will be presented.