Characterization of a Peculiar Einstein Probe Transient EP240408a: An Exotic Gamma-Ray Burst or an Abnormal Jetted Tidal Disruption Event?

Characterization of a Peculiar Einstein Probe Transient EP240408a: An Exotic Gamma-Ray Burst or an Abnormal Jetted Tidal Disruption Event?

We present the results of our multiwavelength (X-ray to radio) follow-up campaign of the Einstein Probe transient EP240408a. The initial 10 s trigger displayed bright soft X-ray (0.5–4 keV) radiation with peak luminosity L _X ≳ 10 ^49 (10 ^50 ) erg s ^−1 for an assumed redshift z ≳ 0.5 (2.0). The Ne...

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Main Authors: Brendan O’Connor, Dheeraj Pasham, Igor Andreoni, Jeremy Hare, Paz Beniamini, Eleonora Troja, Roberto Ricci, Dougal Dobie, Joheen Chakraborty, Mason Ng, Noel Klingler, Viraj Karambelkar, Sam Rose, Steve Schulze, Geoffrey Ryan, Simone Dichiara, Itumeleng Monageng, David Buckley, Lei Hu, Gokul P. Srinivasaragavan, Gabriele Bruni, Tomás Cabrera, S. Bradley Cenko, Hendrik van Eerten, James Freeburn, Erica Hammerstein, Mansi Kasliwal, Chryssa Kouveliotou, Keerthi Kunnumkai, James K. Leung, Amy Lien, Antonella Palmese, Takanori Sakamoto
Format: Article
Language:English
Published: IOP Publishing 2025-01-01
Series:The Astrophysical Journal Letters
Subjects:
X-ray astronomy
X-ray transient sources
Relativistic jets
Gamma-ray bursts
Black holes
Online Access:https://doi.org/10.3847/2041-8213/ada7f5
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https://doi.org/10.3847/2041-8213/ada7f5

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