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SVOM GRB 250314A at z simeq 7.3: an exploding star in the era of reionization

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arxiv 2507.18783 v1 pith:NNTTREKQ submitted 2025-07-24 astro-ph.HE

SVOM GRB 250314A at z simeq 7.3: an exploding star in the era of reionization

B. Cordier , J. Y. Wei , N. R. Tanvir , S. D. Vergani , D. B. Malesani , J. P. U. Fynbo , A. de Ugarte Postigo , A. Saccardi
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F. Daigne J.-L. Atteia O. Godet D. Gotz Y. L. Qiu S. Schanne L. P. Xin B. Zhang S. N. Zhang A. J. Nayana L. Piro B. Schneider A. J. Levan A. L. Thakur Z. P. Zhu G. Corcoran N. A. Rakotondrainibe V. D'Elia D. Turpin J. F. Agui Fernandez M. A. Aloy J. An M. Bai S. Basa M. G. Bernardini A. Bochenek R. Brivio M. Brunet G. Bruni S. B. Cenko Q. Cheng A. Chrimes L. Christensen A. Claret A. Coleiro L. Cotter S. Crepaldi J. S. Deng Dimple Y. W. Dong D. Dornic P. A. E. Evans R. A. J. Eyles-Ferris H. Fausey M. Ferro L. Galbany M. Garnichey G. Gianfagna B. P. Gompertz H. Goto N. Habeeb P. Y. Han X. H. Han D. H. Hartmann K. E. Heintz J. Y. Hu M. H. Huang L. Izzo P. Jakobsson J. A. Kennea C. Lachaud T. Laskar D. Li H. L. Li R. Z. Li X. Liu Y. Liu G. Lombardi H. Louvin P. Maggi T. Maiolino Q. Y. Mao A. Martin-Carrillo K. Mercier P. O'Brien J. T. Palmerio P. Petitjean D. L. A. Pieterse F. Piron G. Pugliese B. C. Rayson T. Reynolds F. Robinet A. Rossi R. Salvaterra C. C. Thone B. Topcu C. W. Wang J. Wang Y. Wang C. Wu S. L. Xiong D. Xu H. N. Yang W. M. Yuan Y. H. Zhang X. F. Zhang S. J. Zheng
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classification astro-ph.HE
keywords svomfollow-upnear-infraredraresimeqadaptedafterglowafterglows
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Most long Gamma-ray bursts originate from a rare type of massive stellar explosion. Their afterglows, while rapidly fading, can be initially extremely luminous at optical/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 with the near-infrared afterglow discovery and the spectroscopic measurements of its redshift z $\simeq$ 7.3 . This burst happened when the Universe was only $\sim$ 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 optimize their identification with adapted ground follow-up observation strategies.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. First Gamma-Ray Burst Observations with SVOM

    astro-ph.HE 2026-07 unverdicted novelty 6.0

    SVOM has begun detecting and characterizing gamma-ray bursts from space, validating its multi-band capabilities on both shared and SVOM-only events.

  2. SVOM/VT: Real-Time Onboard Data Processing

    astro-ph.IM 2026-04 unverdicted novelty 4.0

    SVOM/VT onboard pipeline processes images in real time to deliver VHF data for 78% of slewed GRBs and identify optical counterparts in 56% of cases within 18 minutes.

  3. SVOM/VT: Instrument Overview, Science Objectives, and First-Year Performance

    astro-ph.HE 2026-04 unverdicted novelty 4.0

    The SVOM/VT instrument reaches 22.5 AB mag sensitivity and detects about 80% of targeted gamma-ray bursts, outperforming Swift/UVOT and enabling high-redshift studies.

  4. The data analysis pipeline for the Microchannel X-ray Telescope on board the SVOM mission

    astro-ph.IM 2026-04 unverdicted novelty 3.0

    The MXT data analysis pipeline automatically processes raw X-ray event data into calibrated science products for the SVOM mission's observations of GRBs and transients.

  5. SVOM/VT: Flight Model Verification and Pre-launch Testing

    astro-ph.IM 2026-04 unverdicted novelty 2.0

    Pre-launch tests confirm the SVOM/VT flight model meets requirements for stray light suppression, thermal stability, and detection sensitivity of magnitude 22.5.