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The Einstein Probe Transient EP240414a: Linking Fast X-Ray Transients, Gamma-Ray Bursts, and Luminous Fast Blue Optical Transients

  • Authors: Joyce N. D. van Dalen, Andrew J. Levan, Peter G. Jonker, Daniele Bjørn Malesani, Luca Izzo, Nikhil Sarin, Jonathan Quirola-Vásquez, Daniel Mata Sánchez, Antonio de Ugarte Postigo, Agnes P. C. van Hoof, Manuel A. P. Torres, Steve Schulze, Stuart P. Littlefair, Ashley Chrimes, Maria E. Ravasio, Franz E. Bauer, Antonio Martin-Carrillo, Morgan Fraser, Alexander J. van der Horst, Pall Jakobsson, Paul O'Brien, Massimiliano De Pasquale, Giovanna Pugliese, Jesper Sollerman, Nial R. Tanvir, Tayyaba Zafar, Joseph P. Anderson, Lluís Galbany, Avishay Gal-Yam, Mariusz Gromadzki, Tomás E. Müller-Bravo, Fabio Ragosta, Jacco H. Terwel

Joyce N. D. van Dalen et al 2025 The Astrophysical Journal Letters 982 .

  • Provider: AAS Journals

Caption: Figure 8.

Absolute magnitude vs. host-normalized offset Rnorm for long GRBs (J. S. Bloom et al. 2002; P. K. Blanchard et al. 2016), short GRBs (W.-f. Fong et al. 2022), SN Ic-BL with and without a GRB (J. Japelj et al. 2018), and LFBOTs with reported host offsets: AT2018cow (S. J. Prentice et al. 2018), CSS161010 (D. L. Coppejans et al. 2020), ZTF18abvkwla (A. Y. Q. Ho et al. 2020b), AT2020mrf (Y. Yao et al. 2022), AT2023fhn (A. A. Chrimes et al. 2024b), and EP240414a. At the top and right-hand side of the plot the distributions in Rnorm and absolute magnitude of the GRBs and the SNe Ic-BL are shown, respectively. The black solid curves on top of these distributions indicates the density of the sum of these distributions, similar to the 2D density underlying the populations in the main figure. When compared to the long-GRB population and the SN Ic-BL population, EP240414a has a large normalized offset, which is more in line with that of short GRBs. In the small sample of LFBOTs, AT2023fhn has a normalized offset similar to that of EP240414a. The absolute magnitude of the host galaxy of EP240414a is similar to that of the brightest hosts of GRBs and LFBOTs.

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