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Title: Data analysis method for the search of point sources of gamma rays with the HAGAR telescope array
Authors: Britto, R. J
Acharya, B. S
Anupama, G. C
Bhattacharjee, P
Chitnis, V. R
Cowsik, R
Dorji, N
Duhan, S. K
Gothe, K. S
Kamath, P. U
Mahesh, P. K
Manoharan, J
Nagesh, B. K
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
Keywords: Gamma rays: atmospheric;Cherenkov technique;Methods: data analysis;Telescopes: HAGAR
Issue Date: Dec-2011
Publisher: French Society of Astronomy and Astrophysics
Citation: SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: G. Alecian, K. Belkacem, R. Samadi and D. Valls-Gabaud, pp.535 - 538
Abstract: The High Altitude GAmma-Ray (HAGAR) experiment is the highest altitude atmospheric Cherenkov sampling array, set up at 4300 m amsl in the Himalayas (Northern India). It constitutes 7 telescopes, each one with seven 90 cm-diameter mirrors, a field of view of 3 degrees, and was designed to reach a relatively low threshold (currently around 200 GeV) with quite a low total mirror area (31 m^2). In order to remove the strong isotropic background of charged cosmic rays, data are collected by tracking separately ON-source followed by OFF-source regions, or vice-versa. Typical observations period is about 30-40 min. ON-OFF data pairs are then selected according to quality parameters such as stability of the trigger rate and the comparison of average trigger rates between ON and OFF-source data sets. Signal extraction from point sources is done by performing analysis cuts on the count rate excess, rejecting off-axis events. Validation of method and systematics are evaluated through the analysis of fake sources (OFF-OFF pairs) located at similar declination as the observed point sources. Spurious signal, if any, would show up in this study.
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