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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 5.

Three key comparisons to our spectroscopy at different epochs. The comparison spectra are shifted to the observed wavelength of the EP240414a spectra. The top panel shows a comparison of our 0.62 day GTC spectrum with AT2018cow at ~5 days. The middle panel presents the SN Ic-BL in the GTC spectrum taken at 19.5 days as compared to SN 1998bw at ~13 days and SN 2006aj at ~4 days. We obtained the best fit with SN 1998bw when fitting with both Gelato (A. H. Harutyunyan et al. 2008) and SNID (S. Blondin & J. L. Tonry 2007). The bottom panel shows a MUSE spectrum extracted at the transient location at ~81 days. The SN has faded significantly at this epoch. We find the best-fit spectrum at this time is SN 1997ef at ~38 days.

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