The paper identifies supernova emission matching a scaled SN 1998bw template in the late-time light curve of EP250302a at z=1.131, with early data constraining the jet Lorentz factor above 25.
A fast X-ray transient with chromatic flares: signatures of violent collisions induced by late-time central engine reactivation
2 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Extragalactic Fast X-ray Transients (EFXTs) represent an emerging class of high-energy phenomena characterized by X-ray outbursts lasting from tens to hundreds of seconds. However, for more than half of the EFXTs, their physical origins remain elusive. In this Letter, we report the discovery of EP250302a, a luminous EFXT detected by the Einstein Probe (EP) at a redshift of $z = 1.131$. The multi-wavelength light curves of EP250302a reveal remarkable temporal features that distinguish it from the previously known EP-detected EFXT population, most notably a needle-like X-ray flare accompanied by smooth optical rebrightening during the afterglow phase. We suggest that the distinct X-ray and optical behaviors constitute the first observed instance of late-time violent collision of two relativistic shells in an EFXT. Drawing on insights from GRB studies, such a collision process strongly indicates the reactivation of a central engine, making EP250302a-like transients a unique laboratory for probing the late-time activity and jet physics of EFXT central engines.
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astro-ph.HE 2years
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UNVERDICTED 2representative citing papers
New early multi-wavelength data on GRB 230328B shows afterglow with early bump and late achromatic rebrightening at ~4000 s, modeled via MCMC as forward shock plus late energy injection in a dusty S0 host with AV~0.8 and no supernova signature.
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Discovery of a Supernova Following the Einstein Probe Transient EP250302a at z = 1.131
The paper identifies supernova emission matching a scaled SN 1998bw template in the late-time light curve of EP250302a at z=1.131, with early data constraining the jet Lorentz factor above 25.
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Earliest simultaneous multi-color optical observations of GRB 230328B: from 41 seconds to the host-galaxy identification
New early multi-wavelength data on GRB 230328B shows afterglow with early bump and late achromatic rebrightening at ~4000 s, modeled via MCMC as forward shock plus late energy injection in a dusty S0 host with AV~0.8 and no supernova signature.