The fast X-ray transient EP240315a: a z ~ 5 gamma-ray burst in a Lyman continuum leaking galaxy
Andrew J. Levan, Peter G. Jonker, Andrea Saccardi, Daniele Bj{o}rn Malesani, Nial R. Tanvir, Luca Izzo, Kasper E. Heintz, Daniel Mata S’anchez, Jonathan Quirola-V’asquez, 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, Jos’e Feliciano Ag"u’i Fern’andez, 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, Llu’is 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, Dani"elle L. A. Pieterse, Silvia Piranomonte, Luigi Piro, Giovanna Pugliese, Maria E. Ravasio, Ben Rayson, Ruben Salvaterra, Rub’en S’anchez-Ram’irez, Nikhil Sarin, Samuel P. R. Shilling, Rhaana L. C. Starling, Gianpiero Tagliaferri, Aishwarya Linesh Thakur, Christina C. Th"one, Klaas Wiersema, Isabelle Worssam, Tayyaba Zafar
arXiv:2404.16350v1 Announce Type: new
Abstract: 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.arXiv:2404.16350v1 Announce Type: new
Abstract: 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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