ASKAP J005512.2-255834: A Luminous, Long-Lived Radio Transient at z = 0.1 -- an Orphan Afterglow or an off-nuclear TDE from an IMBH?

arXiv (Cornell University) 2026 Preprint Open access

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Authors: Ashna Gulati, Tara Murphy, David L. Kaplan, Dougal Dobie, Charlotte Ward, G. E. Anderson, Manisha Caleb, Poonam Chandra, Jeff Cooke, Barnali Das, Adam T. Deller, A J Goodwin
+15 more K. Gourdji, Giancarlo Ghirlanda, E. Lenc, Anais Möller, James K. Leung, Stella Koch Ocker, Joshua Pritchard, Claudio Ricci, Elaine M. Sadler, Om Sharan Salafia, Kavya Shaji, Roberto Soria, Mark Suhr, Artem V. Tuntsov, Ziteng Wang
DOI: 10.48550/arxiv.2602.20522
Cited by: 1

Abstract

We report the discovery of a slowly evolving, extragalactic radio transient, ASKAP J005512.2--255834 (hereafter ASKAP J0055-2558), identified using the Australian SKA Pathfinder in a search for orphan afterglows associated with archival gravitational wave events. Although discovered in this context, there is no evidence that the transient is associated with any known gravitational wave event. Nonetheless, this source exhibits a 20-fold increase in flux density over $

Fields of Study & Subjects

Pulsars and Gravitational Waves Research Gamma-ray bursts and supernovae Astrophysical Phenomena and Observations

Publication details

Journal / source
arXiv (Cornell University)
Publication date
24 February 2026
Document type
Preprint