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The Hidden Evolution of Gamma-Ray Burst Jets Revealed by Gravitational Waves
Gerardo Urrutia, Fabio De Colle, Agnieszka Janiuk +2
Gamma-ray burst (GRB) jets can propagate through massive stars, where the high opacity of the stellar envelope traps electromagnetic radiation and limits observations of the jet at…
A Multi-Wavelength View of the First Type Ic-BL Supernova with an Einstein Probe X-ray Shock Breakout
Jillian C. Rastinejad, Gokul Srinivasaragavan, Nikhil Sarin +36
In March 2026, the Einstein Probe (EP) discovered its most nearby (z = 0.0343) Fast X-ray Transient (FXT), EP260321a, the first EP FXT to provide a strong match to expectations for…
The Radio Properties of Extreme Coronal Line Emitters: Constraints on the Sub-parsec Environment
Noah Franz, Kate D. Alexander, Collin T. Christy +10
A tiny fraction () of galaxies display luminous, high-ionization metal emission lines, which may be persistent or variable. These extreme coronal lines (ECLs) are produced…
Old and Bright: The Remarkable Radio Brightening of the Engine-driven SN 2012au Several Years After Explosion Signals the Birth of a PWN
Eli Wiston, Raffaella Margutti, A. J. Nayana +23
We present the results from an extensive broad-band (radio to X-rays) observing campaign of the engine-driven Type Ib SN 2012au in the first 13 years of evolution. The early-time (…
Constraining inhomogeneities and asymmetries in SNe, FBOTs, and other high-energy transients from unresolved radio observations
Fabio De Colle, Rosa L. Becerra, Lizeth A. Meza +7
Synchrotron emission in high-energy transients is produced by relativistic electrons accelerated by shocks. As high-energy transients are often unresolved even on angular scales pr…
Failed jet breakout in the metal-poor broad-lined type Ic supernova 2026gzf
Antonio Martin-Carrillo, Christina C. Thöne, James K. Leung +103
A long-standing question in the death of massive stars is the role of relativistic jets. While many gamma-ray bursts and some fast X-ray transients seem to be associated with broad…
A 14-year-old Mystery: The Peculiar Case of the Engine-driven SN 2012ap
Itai Sfaradi, Raffaella Margutti, Ryan Chornock +29
We present late-time ( d) optical (Keck), X-ray (Chandra and NuSTAR), and radio (VLA, ALMA, and the uGMRT) observations of the Type Ic-BL SN 2012ap. Previous studies of…
The Peculiar Radio Evolution of the Tidal Disruption Event ASASSN-19bt
Collin T. Christy, Kate D. Alexander, Yvette Cendes +15
We present detailed radio observations of the tidal disruption event (TDE) ASASSN-19bt/AT2019ahk, obtained with the Australia Telescope Compact Array (ATCA), the Atacama Large Mill…
ClassiPyGRB: Machine Learning-Based Classification and Visualization of Gamma Ray Bursts using t-SNE
Keneth Garcia-Cifuentes, Rosa L. Becerra, Fabio De Colle
Gamma-ray burst (GRBs) are the brightest events in the universe. For decades, astrophysicists have known about their cosmological nature. Every year, space missions such as Fermi a…
Unraveling Parameter Degeneracy in GRB Data Analysis
Keneth Garcia-Cifuentes, Rosa Leticia Becerra, Fabio De Colle +1
Gamma-ray burst (GRB) afterglow light curves and spectra provide information about the density of the environment, the energy of the explosion, the properties of the particle accel…
Machine-Learning Enhanced Photometric Analysis of the Extremely Bright GRB 210822A
Camila Angulo-Valdez, Rosa L. Becerra, Margarita Pereyra +16
We present analytical and numerical models of the bright long GRB 210822A at . The intrinsic extreme brightness exhibited in the optical, which is very similar to other br…
Understanding the Nature of the Optical Emission in Gamma-Ray Bursts: Analysis from TAROT, COATLI, and RATIR Observations
R. L. Becerra, A. Klotz, J. L. Atteia +12
We collected the optical light curve data of 227 gamma-ray bursts (GRBs) observed with the TAROT, COATLI, and RATIR telescopes. These consist of 133 detections and 94 upper limits.…
Numerical simulations of polarisation in gamma-ray burst afterglows
Rogelio Medina Covarrubias, Fabio De Colle, Gerardo Urrutia +1
We compute the linear polarisation during the afterglow phase of gamma-ray bursts, for both on-axis and off-axis observers. We use numerical simulations of the deceleration of a re…
An Optically Targeted Search for Gravitational Waves emitted by Core-Collapse Supernovae during the Third Observing Run of Advanced LIGO and Advanced Virgo
Marek J. Szczepańczyk, Yanyan Zheng, Javier M. Antelis +35
We present the results from a search for gravitational-wave transients associated with core-collapse supernovae observed optically within 30 Mpc during the third observing run of A…
Identification of Extended Emission Gamma-Ray-Bursts Candidates using Machine Learning
K. Garcia-Cifuentes, R. L. Becerra, F. De Colle +2
Gamma-Ray bursts (GRBs) have been traditionally classified based on their duration. The increasing number of extended emission (EE) GRBs, lasting typically more than 2 seconds but…
Gravitational Waves from the Propagation of Long Gamma-Ray Burst jets
Gerardo Urrutia, Fabio De Colle, Claudia Moreno +1
Gamma-ray bursts (GRBs) are produced during the propagation of ultra-relativistic jets. It is challenging to study the jet close to the central source, due to the high opacity of t…
Three-dimensional numerical simulations of structured GRB jets
Gerardo Urrutia, Fabio De Colle, Diego López-Cámara
After the detection of GRB 170817A, the first unambiguous off-axis gamma-ray burst (GRB), several studies tried to understand the structure of GRB jets. The initial jet structure (…
Seven years of coordinated Chandra-NuSTAR observations of SN2014C unfold the extreme mass-loss history of its stellar progenitor
Daniel Brethauer, Raffaella Margutti, Danny Milisavljevic +13
We present the results from our seven-year long broad-band X-ray observing campaign of SN\,2014C with \emph{Chandra} and \emph{NuSTAR}. These coordinated observations represent the…
GRB 191016A: The onset of the forward shock and evidence of late energy injection
M. Pereyra, N. Fraija, A. M. Watson +13
We present optical and near-infrared photometric observations of GRB 191016 with the COATLI, DDOTI and RATIR ground-based telescopes over the first three nights. We present the tem…
Jets in Common Envelopes: a low mass main sequence star in a red giant
Diego Lopez-Camara, Fabio De Colle, Enrique Moreno Mendez +2
We present small-scale three-dimensional hydrodynamical simulations of the evolution of a 0.3Msun main sequence star which launches two perpendicular jets within the envelope of a…
Luminous Late-time Radio Emission from Supernovae Detected by the Karl G. Jansky Very Large Array Sky Survey (VLASS)
M. C. Stroh, G. Terreran, D. L. Coppejans +10
We present a population of 19 radio-luminous supernovae (SNe) with emission reaching in the first epoch of the Very Large Array…
The large landscape of supernova, GRB and cocoon interactions
Fabio De Colle, Pawan Kumar, Peter Hoeflich
Long gamma ray bursts (LGRBs) are associated to the collapse of a massive star and the formation of a relativistic jet. As the jet propagates through the star, it forms an extended…
Survival of the Fittest: Numerical Modeling of Supernova 2014C
Felipe Vargas, Fabio De Colle, Daniel Brethauer +2
Initially classified as a supernova (SN) type Ib, 100 days after the explosion SN\,2014C made a transition to a SN type II, presenting a gradual increase in the H emissio…
Off-Axis Emission of Short GRB Jets from Double Neutron Star Mergers and GRB 170817A
Jonathan Granot, Ramandeep Gill, Dafne Guetta +1
The short-duration (s) GRB 170817A in the nearby (Mpc) elliptical galaxy NGC 4993 is the first electromagnetic counterpart of the first gravitational wave (GW)…