SVOM GRB 250314A at z ≃ 7.3: An exploding star in the era of re-ionization

Cordier, B; Wei, JY; Tanvir, NR; Vergani, SD; Malesani, DB; Fynbo, JPU; de Ugarte Postigo, A; Saccardi, A; Daigne, F; Atteia, JL; Godet, O; Götz, D; Qiu, YL; Schanne, S; Xin, LP; Zhang, B; Zhang, SN; Nayana, AJ; Piro, L; Fausey, H; Schneider, B; Levan, AJ; Thakur, AL; Zhu, ZP; Corcoran, G; Rakotondrainibe, NA; D’Elia, V; Turpin, D; Agüí Fernández, JF; Aloy, MA; An, J; Bai, M; Basa, S; Bernardini, MG; Bochenek, A; Brivio, R; Brunet, M; Bruni, G; Cenko, SB; Cheng, Q; Chrimes, A; Christensen, L; Claret, A; Coleiro, A; Cotter, L; Crepaldi, S; Deng, JS; Dimple; Dong, YW; Dornic, D; Evans, PA; Eyles-Ferris, RAJ; Ferro, M; Galbany, L; Garnichey, M; Gianfagna, G; Gompertz, BP; Goto, H; Habeeb, N; Han, PY; Han, XH; Hartmann, DH; Heintz, KE; Hu, JY; Huang, MH; Izzo, L; Jakobsson, P; Kennea, JA; Lachaud, C; Laskar, T; Li, D; Li, HL; Li, RZ; Liu, X; Liu, Y; Lombardi, G; Louvin, H; Maggi, P; Maiolino, T; Mao, QY; Martin-Carrillo, A; Mercier, K; O’Brien, P; Palmerio, JT; Petitjean, P; Pieterse, DLA; Piron, F; Pugliese, G; Rayson, BC; Reynolds, T; Robinet, F; Rossi, A; Salvaterra, R; Thöne, CC; Topçu, B; Wang, CW; Wang, J; Wang, Y; Wu, C; Xiong, SL; Xu, D; Yang, HN; Yuan, W-M; Zhang, Y-H; Zhang, XF; Zheng, S

SVOM GRB 250314A at z ≃ 7.3: An exploding star in the era of re-ionization

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Cordier, B, Wei, JY, Tanvir, NR ORCID: 0000-0003-3274-6336, Vergani, SD ORCID: 0000-0001-9398-4907, Malesani, DB, Fynbo, JPU ORCID: 0000-0002-8149-8298, de Ugarte Postigo, A ORCID: 0000-0001-7717-5085, Saccardi, A ORCID: 0000-0002-6950-4587, Daigne, F, Atteia, JL ORCID: 0000-0001-7346-5114, Godet, O ORCID: 0000-0001-7635-9544, Götz, D ORCID: 0000-0001-9494-0981, Qiu, YL, Schanne, S ORCID: 0009-0007-1271-9900, Xin, LP ORCID: 0000-0002-9422-3437, Zhang, B ORCID: 0000-0002-9725-2524, Zhang, SN ORCID: 0000-0001-5586-1017, Nayana, AJ, Piro, L, Fausey, H ORCID: 0000-0002-2927-2398 et al (2025) SVOM GRB 250314A at z ≃ 7.3: An exploding star in the era of re-ionization. Astronomy & Astrophysics, 704. ISSN 0004-6361

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Publisher URL: https://doi.org/10.1051/0004-6361/202556580

Open Access URL: https://doi.org/10.1051/0004-6361/202556580 (Published version)

Abstract

Most long gamma-ray bursts (LGRBs) originate from a rare type of massive stellar explosion. Their afterglows, while rapidly fading, can initially be extremely luminous at optical and near-infrared wavelengths, making them detectable at large cosmological distances. Here we report the detection and observations of GRB 250314A by the SVOM satellite and the subsequent follow-up campaign that led to the discovery of the near-infrared afterglow and spectroscopic measurements of its redshift z ≃ 7.3. This burst occurred when the Universe was only about 5% of its current age. We discuss the signature of these rare events within the context of the SVOM operating model and the ways to optimise their identification with adapted ground follow-up observation strategies.

Item Type:	Article
Uncontrolled Keywords:	5101 Astronomical Sciences; 51 Physical Sciences; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics; 5101 Astronomical sciences; 5107 Particle and high energy physics; 5109 Space sciences
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	EDP Sciences
Date of acceptance:	28 September 2025
Date of first compliant Open Access:	19 January 2026
Date Deposited:	19 Jan 2026 09:52
Last Modified:	19 Jan 2026 09:52
DOI or ID number:	10.1051/0004-6361/202556580
URI:	https://researchonline.ljmu.ac.uk/id/eprint/27934

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