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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© The Authors 2026. Open Access article, https://www.edpsciences.org, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.This article is published in open access under the https://www.aanda.org/subscribe-to-open-faqs. mailto:subscribers@edpsciences.org to support open access publication. We report on serendipitous Euclid observations of previously known transients, using the Euclid Q1 data release. By cross-matching with the Transient Name Server (TNS) we identify 164 transients that coincide with the data release. Although the Euclid Q1 release only includes single-epoch data, we are able to make Euclid photometric measurements at the location of 161 of these transients, where 67 had a significant flux measurement in at least one band. Euclid obtained deep photometric measurements or upper limits of these transients in the IE, YE, JE, and HE bands at various phases of the transient light curves, including before, during, and after the observations of ground-based transient surveys. Approximately 70% of known transients reported in the six months before the Euclid observation date and with a discovery magnitude brighter than 24 were detected in Euclid IE images. Our observations include one of the earliest near-infrared detections of a Type Ia supernova (SN 2024pvw) 15 days prior to its peak brightness, and the late-phase (435.9 days post peak) observations of the enigmatic core-collapse SN 2023aew. Euclid deep photometry provides valuable information on the nature of these transients such as their progenitor systems and power sources, with late-time observations being a uniquely powerful contribution. In addition, Euclid is able to detect the host galaxies of some transients that were previously classed as hostless. The Q1 data demonstrate the power of the Euclid data even with only single-epoch observations available, as will be the case for much larger areas of sky in the Euclid Wide Survey.
Author(s): Duffy C, Cappellaro E, Botticella MT, Hook IM, Poidevin F, Moriya TJ, Chrimes AA, Petrecca V, Paterson K, Goobar A, Galbany L, Kotak R, Gall C, Gutierrez CM, Tao C, Izzo L, Aghanim N, Altieri B, Amara A, Andreon S, Auricchio N, Baccigalupi C, Baldi M, Balestra A, Bardelli S, Basset A, Battaglia P, Biviano A, Bonchi A, Branchini E, Brescia M, Brinchmann J, Camera S, Capobianco V, Carbone C, Carretero J, Casas R, Casas S, Castellano M, Castignani G, Cavuoti S, Cimatti A, Colodro-Conde C, Congedo G, Conselice CJ, Conversi L, Copin Y, Courbin F, Courtois HM, Cropper M, Da Silva A, Degaudenzi H, De Lucia G, Di Giorgio AM, Dolding C, Dole H, Dubath F, Duncan CAJ, Dupac X, Dusini S, Ealet A, Escoffier S, Farina M, Faustini F, Ferriol S, Fotopoulou S, Frailis M, Franzetti P, Galeotta S, George K, Gillis B, Giocoli C, Gomez-Alvarez P, Grazian A, Grupp F, Gwyn S, Haugan SVH, Hoar J, Hoekstra H, Holmes W, Hormuth F, Hornstrup A, Hudelot P, Jahnke K, Jhabvala M, Keihanen E, Kermiche S, Kubik B, Kuijken K, Kummel M, Kunz M, Kurki-Suonio H, Le Boulc'h Q, Le Brun AMC, Le Mignant D, Liebing P, Ligori S, Lilje PB, Lindholm V, Lloro I, Maino D, Maiorano E, Mansutti O, Marcin S, Marggraf O, Martinelli M, Martinet N, Marulli F, Massey R, Medinaceli E, Melchior M, Mellier Y, Meneghetti M, Merlin E, Meylan G, Moresco M, Morris PW, Moscardini L, Neissner C, Nichol RC, Niemi S-M, Nightingale JW, Padilla C, Paltani S, Pasian F, Pedersen K, Percival WJ, Pettorino V, Pires S, Polenta G, Poncet M, Popa LA, Raison F, Rebolo R, Renzi A, Rhodes J, Riccio G, Romelli E, Roncarelli M, Saglia R, Sakr Z, Sapone D, Sartoris B, Schewtschenko JA, Schirmer M, Schneider P, Schrabback T, Secroun A, Seidel G, Serrano S, Simon P, Sirignano C, Sirri G, Skottfelt J, Stanco L, Steinwagner J, Tallada-Crespi P, Taylor AN, Tereno I, Toledo-Moreo R, Torradeflot F, Tutusaus I, Valenziano L, Vassallo T, Verdoes Kleijn G, Wang Y, Weller J, Zacchei A, Zamorani G, Zerbi FM, Zucca E, Burigana C, Cabanac R, Gabarra L, Scottez V, Scott D, Sullivan M
Publication type: Article
Publication status: Published
Journal: Astronomy and Astrophysics
Year: 2026
Volume: 711
Print publication date: 01/07/2026
Online publication date: 30/06/2026
Acceptance date: 09/05/2025
Date deposited: 17/07/2026
ISSN (print): 0004-6361
ISSN (electronic): 1432-0746
Publisher: EDP Sciences
URL: https://doi.org/10.1051/0004-6361/202554600
DOI: 10.1051/0004-6361/202554600
Data Access Statement: Table A.1 is available at the CDS via anonymous ftp to https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/711/A38
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