DOI

https://doi.org/10.48717/8k20-ta05

Project

RSB04

Title

e-EVN: EA077A, RSB04, RM020

Abstract

We have recently discovered a target in our search for transient polarised pulses in LOFAR data that shows 10-s long pulses, nearly 100% circularly polarised and bright (up to 0.3 Jy), every 70 minutes. Two plausible hypotheses can explain this intriguing target: (a) it is a relatively nearby (< 50 pc) cold brown dwarf or (b) it is a relatively far away (~ kpc) compact object. Prior to a full astrometrprogram to distinguish between these two hypotheses, this short observation aims to: (1) confirm the ephemeris -- because the target's duty cycle is very short (0.25%), astrometric observations must be scheduled such that the pulse does not occur during a calibration scan. We have a tentative timing solution for the target and the short observation will allow us to check our timing solution and greatly aid in planning the astrometric observations. (2) identify any potential phase-reference sources closer to the target.