Search for pulsars and transients with the GMRT

TL;DR

This paper reports the discovery of 21 pulsars, including seven millisecond pulsars, using the GMRT through targeted and blind surveys, and discusses follow-up studies and innovative localization and candidate analysis techniques.

Contribution

First Galactic millisecond pulsars discovered with GMRT; introduces a novel simultaneous time-domain and imaging approach with machine learning for pulsar localization and candidate analysis.

Findings

Discovered 7 millisecond pulsars in Fermi searches

Found 13 pulsars in GHRSS survey, including recycled pulsars

Developed efficient candidate investigation methods with machine learning

Abstract

This paper details on the discovery of 21 pulsars using the Giant Metrewave Radio Telescope (GMRT) from targeted (Fermi directed search) and blind surveys (GMRT High Resolution Southern Sky - GHRSS) and results from the follow up studies. We discovered seven millisecond pulsars (MSPs) in the Fermi directed searches, which are the first Galactic MSPs discovered with the GMRT. We have discovered 13 pulsars (including a MSP and two mildly recycled pulsars) with the GHRSS survey, which is an off-Galactic-plane survey at 322 MHz with complementary target sky (declination range -40 deg to -54 deg) to other ongoing low-frequency surveys by GBT and LOFAR. The simultaneous time-domain and imaging study for localising pulsars and transients and efficient candidate investigation with machine learning are some of the features of the GHRSS survey, which are also finding application in the SKA design methodology.