Discovering Millisecond Pulsars in Globular Clusters with the GMRT (GCGPS)

arXiv:2607.11461 · astro-ph.HE · Submitted 2026-07-13 · Read on arXiv

Jyotirmoy Das, Jayanta Roy, Paulo C. C. Freire, Scott M Ransom, Bhaswati Bhattacharyya, Karel Adámek, Wes Armour, Sanjay Kudale, Mekhala V. Muley

National Center for Radio Astrophysics · National Center for Radio Astrophysics · Max-Planck-Institut für Radioastronomie · National Radio Astronomy Observatory · National Center for Radio Astrophysics · Department of Physics, Silesian University in Opava, Opava, Czech Republic · Oxford e-Research Center · Giant Metrewave Radio Telescope · Giant Metrewave Radio Telescope

astro-ph.HE

Submitted: 2026-07-13

Comments: 5 pages and 4 figures; Submitted to URSI Radio Science Letters (RSL)

Code: https://github.com/jyotirmoydas5392/Pulsar_Search_Script

Project page: https://www.ncra.tifr.res.in/~jroy/GC.html

License: http://creativecommons.org/licenses/by-nc-nd/4.0/

The gist: The Globular Clusters GMRT Pulsar Search (GCGPS) project, launched in mid-May 2023, has emerged as one of the most successful pulsar surveys conducted with the upgraded Giant Metrewave Radio

Terminology

Abstract

The Globular Clusters GMRT Pulsar Search (GCGPS) project, launched in mid-May 2023, has emerged as one of the most successful pulsar surveys conducted with the upgraded Giant Metrewave Radio Telescope (uGMRT), leading to the discovery of several new millisecond pulsars (MSPs). The recently concluded Phase I of the survey resulted in the discovery of seven MSPs across four globular clusters (GCs), all of which previously had no known pulsars. These discoveries have enabled the precise determination of the dispersion measures (DMs) for the respective clusters for the first time. Consistent timing follow-up revealed that out of the seven MSPs, three are confirmed binaries, while two are isolated. This paper summarises the design and the implementation of Phase I of the GCGPS project, presents the key scientific results obtained so far, and outlines the strategy and progress of the recently initiated Phase II observations.

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