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The fast X-ray transient EP240315a: a z ~ 5 gamma-ray burst in a Lyman continuum leaking galaxy

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arxiv 2404.16350 v1 pith:TQCZNDYV submitted 2024-04-25 astro-ph.HE

Andrew J. Levan , Peter G. Jonker , Andrea Saccardi , Daniele Bj{o}rn Malesani , Nial R. Tanvir , Luca Izzo , Kasper E. Heintz , Daniel Mata Sánchez
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Jonathan Quirola-Vásquez Manuel A. P. Torres Susanna D. Vergani Steve Schulze Andrea Rossi Paolo D'Avanzo Benjamin Gompertz Antonio Martin-Carrillo Antonio de Ugarte Postigo Benjamin Schneider Weimin Yuan Zhixing Ling Wenjie Zhang Xuan Mao Yuan Liu Hui Sun Dong Xu Zipei Zhu José Feliciano Agüí Fernández Lorenzo Amati Franz E. Bauer Sergio Campana Francesco Carotenuto Ashley Chrimes Joyce N.D. van Dalen Valerio D'Elia Massimo Della Valle Massimiliano De Pasquale Vikram S. Dhillon Lluís Galbany Nicola Gaspari Giulia Gianfagna Andreja Gomboc Nusrin Habeeb Agnes P. C. van Hoof Youdong Hu Pall Jakobsson Yashaswi Julakanti Judith Korth Chryssa Kouveliotou Tanmoy Laskar Stuart P. Littlefair Elisabetta Maiorano Jirong Mao Andrea Melandri M. Coleman Miller Tamal Mukherjee Samantha R. Oates Paul O'Brien Jesse T. Palmerio Hannu Parviainen Daniëlle L. A. Pieterse Silvia Piranomonte Luigi Piro Giovanna Pugliese Maria E. Ravasio Ben Rayson Ruben Salvaterra Rubén Sánchez-Ramírez Nikhil Sarin Samuel P. R. Shilling Rhaana L. C. Starling Gianpiero Tagliaferri Aishwarya Linesh Thakur Christina C. Thöne Klaas Wiersema Isabelle Worssam Tayyaba Zafar
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The nature of the minute-to-hour long Fast X-ray Transients (FXTs) localised by telescopes such as Chandra, Swift, and XMM-Newton remains mysterious, with numerous models suggested for the events. Here, we report multi-wavelength observations of EP240315a, a 1600 s long transient detected by the Einstein Probe, showing it to have a redshift of z=4.859. We measure a low column density of neutral hydrogen, indicating that the event is embedded in a low-density environment, further supported by direct detection of leaking ionising Lyman-continuum. The observed properties are consistent with EP240315a being a long-duration gamma-ray burst, and these observations support an interpretation in which a significant fraction of the FXT population are lower-luminosity examples of similar events. Such transients are detectable at high redshifts by the Einstein Probe and, in the (near) future, out to even larger distances by SVOM, THESEUS, and Athena, providing samples of events into the epoch of reionisation.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 6 citations worldwide. Full citation record

  1. Comparing the Space Densities of Millisecond-Spin Magnetars and Fast X-Ray Transients

    astro-ph.HE 2025-06 conditional novelty 5.0 of 10

    Millisecond magnetars formed through any known channel can account for at most roughly 10% of fast X-ray transients, so another progenitor must dominate.

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