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?

The Astrophysical Journal 2026 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 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: 10.3847/1538-4357/ae4351
Cited by: 2
References: 278

Abstract

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 Astrophysics and Cosmic Phenomena

Publication details

Journal / source
The Astrophysical Journal
Publisher
American Astronomical Society
Volume
1000
Issue
1
Pages
118–118
Publication date
17 March 2026
Language
EN