PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
Search for point sources of gamma-rays above 50 TeV with the GRAPES-3 experiment.
D. Pattanaik*, S. Ahmed, M. Chakraborty, S.K. Dugad, U.D. Goswami, S.K. Gupta, B. Hariharan, Y. Hayashi, P. Jagadeesan, A. Jain, P. Jain, S. Kawakami, H. Kojima, S. Mahapatra, P.K. Mohanty, R. Moharana, Y. Muraki, P. K Nayak, T. Nonaka, A. Oshima, B.P. Pant, M. Rameez, K. Ramesh, L.V. Reddy, S. Shibata, F. Varsi and M. Zuberiet al. (click to show)
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Pre-published on: July 25, 2023
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The GRAPES-3 is an extensive air shower array located in Ooty (11.4$^\circ$ N, 76.7$^\circ$ E), designed to study cosmic rays and gamma rays at TeV-PeV energies. The compact array of scintillator detectors coupled with a mid-latitude location and shower front curvature corrections enable an angular resolution of $\sim$0.5 degrees above 50 TeV energies, as verified using the Moon shadow method. Furthermore, GRAPES-3 is equipped with a large area (560 m$^2$) muon telescope (called G3MT) to determine the muon content of the recorded air showers. Since large muon content is a defining feature of cosmic ray initiated air showers, G3MT is useful in estimating the muon content and rejecting the overwhelming cosmic ray background. Using both the features of good angular resolution and gamma-hadron separation using the muon content, a search for very high energy (E > 50 TeV) gamma rays from the Crab Nebula is under progress. We have used ten years (2013-2022) of air shower data for this analysis. The detailed methodology, current status, and future plans for detecting point gamma ray sources will be discussed.
DOI: https://doi.org/10.22323/1.444.0922
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