Andrea Melandri

ENGRAVE follow-up of a type IIb supernova spatially coincident with the sub-threshold gravitational wave trigger S250818k

Kendall Ackley, M. T. Botticella, Andreas Boye, Marica Branchesi et autres

The candidate gravitational wave (GW) event S250818k was one of only three non-retracted LIGO-Virgo-KAGRA public alerts issued during the fourth observing run of the network (O4) with a binary neutron star (BNS) merger classification probability exceeding one percent. This triggered a prompt …

A large, chemically enriched, neutral gas reservoir in a galaxy at z = 6.782

A. Saccardi, S. D. Vergani, Luca Izzo, Valerio D'Elia et autres

The physical and chemical characterization of galaxies formed within the first billion years after the Big Bang remains one of the central goals in contemporary astrophysics. For the last two decades, optical and near-infrared spectroscopy of long gamma-ray bursts (GRBs) have been …

fr, dk, it, us, nl, gb, ch, ie, sk (code pays fourni par la source)

GRB 210704A: a luminous fast blue transient in a GRB afterglow at z =2.34

Daniëlle LA Pieterse (22229905), A. J. Levan, Maria Edvige Ravasio, Jillian Rastinejad et autres

We present detailed multiwavelength analysis of GRB 210704A: a Fermi Gamma-ray Burst Monitor discovered and Fermi Large Area Telescope (LAT) detected gamma-ray burst (GRB). The burst is dominated by a short ($\approx 2$ s) pulse followed by weaker softer emission. We line …

GRB 210704A: a luminous fast blue transient in a GRB afterglow at z =2.34

D. L. A. Pieterse, Andrew Levan, Maria Edvige Ravasio, Jillian Rastinejad et autres

ABSTRACT We present detailed multiwavelength analysis of GRB 210704A: a Fermi Gamma-ray Burst Monitor discovered and Fermi Large Area Telescope (LAT) detected gamma-ray burst (GRB). The burst is dominated by a short ($\approx 2$ s) pulse followed by weaker softer emission. We …

nl, gb, it, us, dk, ru, ie, de, es, fr (code pays fourni par la source)

Unveiling the progenitor of SN 2023ixf: Circumstellar dust and its implications for the red supergiant problem

Fabio Ragosta, A. Simongini, Filippo Ambrosino, Matteo Imbrogno et autres

The nearby Type II supernova SN 2023ixf offers a critical test of the long-standing ‘red supergiant problem’ – the apparent absence of high-mass red-supergiant progenitors in pre-explosion imaging. We present new late-time observations of SN 2023ixf: SiFAP2 photometry (714–772 d) with a …

GRB 180728A and SN 2018fip: The nearest high-energy cosmological gamma-ray burst with an associated supernova

A. Rossi, L. Izzo, Keiichi Maeda, P. Schady et autres

Context. The long gamma-ray burst GRB 180728A at a redshift of z = 0.1171 stands out due to its high isotropic energy of E γ, iso ≈ 2.5 × 10 51 erg, in contrast with most events at redshift z < 0.2, …

it, dk, jp, gb, nl, us, ca, es, de, fr, ru, ie, cn, au (code pays fourni par la source)

Unveiling the progenitor of SN 2023ixf: Circumstellar dust and its implications for the red supergiant problem

Fabio Ragosta, A. Simongini, Filippo Ambrosino, Matteo Imbrogno et autres

The nearby Type II supernova SN 2023ixf offers a critical test of the long-standing ‘red supergiant problem’ – the apparent absence of high-mass red-supergiant progenitors in pre-explosion imaging. We present new late-time observations of SN 2023ixf: SiFAP2 photometry (714–772 d) with a …

it, es (code pays fourni par la source)

Continuous Wide-Field Optical Monitoring for Very Early-Phase Transient Discovery

M. Della Valle, Maria Teresa Botticella, Enrico Cappellaro, Roberto Ragazzoni et autres

The study of transient phenomena in a multimessenger context is expected to remain a major pillar of astrophysical discovery in the decades ahead. Supernovae, Kilonovae, Black-Hole formation, Novae, GRBs, and tidal disruption events are prime examples, as their earliest phases link electromagnetic …

Continuous Wide-Field Optical Monitoring for Very Early-Phase Transient Discovery

M. Della Valle, Maria Teresa Botticella, Enrico Cappellaro, Roberto Ragazzoni et autres

The study of transient phenomena in a multimessenger context is expected to remain a major pillar of astrophysical discovery in the decades ahead. Supernovae, Kilonovae, Black-Hole formation, Novae, GRBs, and tidal disruption events are prime examples, as their earliest phases link electromagnetic …

An extremely high-velocity outflow in SMSS J2157-3602, the most luminous quasar in the first 1.3 Gyr

G. Vietri, Paola Rodríguez Hidalgo, Amy Rankine, L. Zappacosta et autres

We report the discovery of an extremely high-velocity outflow (EHVO) in the most luminous QSO (LBol ∼ 2.29 × 1048 erg/s), named SMSS J2157-3602, at z = 4.692. Combined XSHOOTER and NIRES observations reveal that the EHVO reaches a maximum velocity of …

An extremely high-velocity outflow in SMSS J2157-3602, the most luminous quasar in the first 1.3 Gyr

G. Vietri, Paola Rodríguez Hidalgo, Amy L. Rankine, L. Zappacosta et autres

We report the discovery of an extremely high-velocity outflow (EHVO) in the most luminous QSO ( L Bol ∼ 2.29 × 10 48 erg/s), named SMSS J2157-3602, at z = 4.692. Combined XSHOOTER and NIRES observations reveal that the EHVO reaches a …

it, us, gb, ca, jp, au (code pays fourni par la source)

The most distant optically polarised GRB afterglow: GRB 240419A at z = 5.178

R. Brivio, S. Covino, M. Ferro, A. Saccardi et autres

Context. Gamma-ray bursts (GRBs) are extremely bright phenomena powered by relativistic jets arising from explosive events at cosmological distances. The nature of the jet and the configuration of the local magnetic fields are still unclear, with the distinction between different models possibly …

it, fr, ie, jp, cz, cn, us, gb, dk, nl, Afrique du Sud, rs, sk, au (code pays fourni par la source)