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Highlights of the results from the GRAPES-3 experiment

by Hariharan Balakrishnan, S. Ahmad, M. Chakraborty, S.R. Dugad, U.D. Goswami, S.K. Gupta, 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, D. Pattanaik, B.P. Pant, M. Rameez, K. Ramesh, L.V. Reddy, S. Shibata, F. Varsi, M. Zuberi

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Submission summary

Authors (as registered SciPost users): Hariharan Balakrishnan · Fahim Varsi
Submission information
Preprint Link: scipost_202209_00007v1  (pdf)
Date submitted: 2022-09-05 17:25
Submitted by: Balakrishnan, Hariharan
Submitted to: SciPost Physics Proceedings
Proceedings issue: 21st International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI2022)
Ontological classification
Academic field: Physics
  • Gravitation, Cosmology and Astroparticle Physics
Approach: Experimental


The GRAPES-3 is a unique extensive air shower experiment consisting of 400 scintillator detectors spread over an area of 25000 m2 and a 560 m2 muon telescope. The experiment located at Ooty, India has been collecting data for the past two decades. The unique capabilities of GRAPES-3 have allowed the study of cosmic rays over energies from a few TeV to tens of PeV and beyond. The measurement of the directional flux of muons (Eμ≥1 GeV) by the large muon telescope permits an excellent gamma-hadron separation to be made which then in turn becomes a powerful tool in the study of multi-TeV γ-ray sources and the composition of primary cosmic rays. However, the high precision measurements also enable studies of transient atmospheric and interplanetary phenomena such as those produced by the thunderstorms and geomagnetic storms. In this talk some of the exciting new recent results would be presented and updates provided on various ongoing analyses.

Current status:
Has been resubmitted

Reports on this Submission

Report 1 by Eduardo de la Fuente Acosta on 2022-9-30 (Invited Report)

  • Cite as: Eduardo de la Fuente Acosta, Report on arXiv:scipost_202209_00007v1, delivered 2022-09-30, doi: 10.21468/SciPost.Report.5805


1. Science
2. Experiment


1. Comparison and Discussion
2 English


The quality and description of the experiment are outstanding, and the work deserves publication. However, the authors must improve the English of the manuscript to get a more quality paper. I strongly suggest a native English speaker or Angloparlant must review the manuscript. I gave some suggestions (in red) in the attached pdf file. This file also includes my suggestions and comments in blue.

The only significant comment is on the angular resolution issue. The authors compare it with other successful experiments. In some sentences, they said it is better, and in another sentence, they commented it is comparable. The authors must choose the right one. If the angular resolution is better, the issue must be clarified and described in more detail. In case of comparison, values of other experiments are needed to add for contrast. However, for all comparisons, the angular resolution value of all experiments must be mentioned and concluded after contrasting them.

Congratulations to the authors for the experiment, strengthen them to provide a better version of the paper and improved.

Requested changes

1. English
2. Work on comments about angular resolution


  • validity: high
  • significance: high
  • originality: high
  • clarity: good
  • formatting: good
  • grammar: reasonable

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