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View article: The Radio Flare and Multiwavelength Afterglow of the Short GRB 231117A: Energy Injection from a Violent Shell Collision
The Radio Flare and Multiwavelength Afterglow of the Short GRB 231117A: Energy Injection from a Violent Shell Collision Open
We present the early radio detection and multiwavelength modeling of the short gamma-ray burst (GRB) 231117A at redshift z = 0.257. The Australia Telescope Compact Array automatically triggered a 9 hr observation of GRB 231117A at 5.5 and …
View article: JWST reveals a supernova following a gamma-ray burst at <i>z</i> ≃ 7.3
JWST reveals a supernova following a gamma-ray burst at <i>z</i> ≃ 7.3 Open
The majority of long-duration gamma-ray bursts (GRBs) are thought to arise from the collapse of massive stars, making them powerful tracers of star formation across cosmic time. Evidence for this origin comes from the presence of supernova…
View article: SVOM GRB 250314A at <i>z</i> ≃ 7.3: An exploding star in the era of re-ionization
SVOM GRB 250314A at <i>z</i> ≃ 7.3: An exploding star in the era of re-ionization Open
Most long gamma-ray bursts (LGRBs) originate from a rare type of massive stellar explosion. Their afterglows, while rapidly fading, can initially be extremely luminous at optical and near-infrared wavelengths, making them detectable at lar…
View article: Discovery and analysis of afterglows from poorly localized GRBs with the Gravitational-wave Optical Transient Observer (GOTO) All-sky Survey
Discovery and analysis of afterglows from poorly localized GRBs with the Gravitational-wave Optical Transient Observer (GOTO) All-sky Survey Open
Gamma-ray bursts (GRBs), particularly those detected by wide-field instruments such as the Fermi/GBM, pose challenges for optical follow-up because of their large initial localization regions, leaving many GRBs without identified afterglow…
View article: The most distant optically polarised GRB afterglow: GRB 240419A at <i>z</i> = 5.178
The most distant optically polarised GRB afterglow: GRB 240419A at <i>z</i> = 5.178 Open
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 unclea…
View article: JWST Spectroscopy of GRB 250702B: An Extremely Rare and Exceptionally Energetic Burst in a Dusty, Massive Galaxy at $z=1.036$
JWST Spectroscopy of GRB 250702B: An Extremely Rare and Exceptionally Energetic Burst in a Dusty, Massive Galaxy at $z=1.036$ Open
We present follow-up observations of the day-long, repeating GRB 250702B with the Near Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST). Through the identification of narrow hydrogen emission lines at a consis…
View article: GRB 241105A: a test case for GRB classification and rapid <i>r</i> -process nucleosynthesis channels
GRB 241105A: a test case for GRB classification and rapid <i>r</i> -process nucleosynthesis channels Open
Gamma-ray bursts (GRBs) offer a powerful window to probe the progenitor systems responsible for the formation of heavy elements through the rapid neutron capture (r-) process, thanks to their exceptional luminosity, which allows them to be…
View article: Discovery and Analysis of Afterglows from Poorly Localised GRBs with the Gravitational-wave Optical Transient Observer (GOTO) All-sky Survey
Discovery and Analysis of Afterglows from Poorly Localised GRBs with the Gravitational-wave Optical Transient Observer (GOTO) All-sky Survey Open
Gamma-ray bursts (GRBs), particularly those detected by wide-field instruments such as the Fermi/GBM, pose a challenge for optical follow-up due to their large initial localisation regions, leaving many GRBs without identified afterglows. …
View article: The Day-long, Repeating GRB 250702B: A Unique Extragalactic Transient
The Day-long, Repeating GRB 250702B: A Unique Extragalactic Transient Open
γ -ray bursts (GRBs) are singular outbursts of high-energy radiation with durations typically lasting from milliseconds to minutes and, in extreme cases, a few hours. They are attributed to the catastrophic outcomes of stellar-scale events…
View article: The radio flare and multi-wavelength afterglow of the short GRB 231117A: energy injection from a violent shell collision
The radio flare and multi-wavelength afterglow of the short GRB 231117A: energy injection from a violent shell collision Open
We present the early radio detection and multi-wavelength modeling of the short gamma-ray burst (GRB) 231117A at redshift $z=0.257$. The Australia Telescope Compact Array automatically triggered a 9-hour observation of GRB 231117A at 5.5 a…
View article: SVOM GRB 250314A at z $\simeq$ 7.3: an exploding star in the era of reionization
SVOM GRB 250314A at z $\simeq$ 7.3: an exploding star in the era of reionization Open
Most long Gamma-ray bursts originate from a rare type of massive stellar explosion. Their afterglows, while rapidly fading, can be initially extremely luminous at optical/near-infrared wavelengths, making them detectable at large cosmologi…
View article: JWST reveals a supernova following a gamma-ray burst at z $\simeq$ 7.3
JWST reveals a supernova following a gamma-ray burst at z $\simeq$ 7.3 Open
The majority of energetic long-duration gamma-ray bursts (GRBs) are thought to arise from the collapse of massive stars, making them powerful tracers of star formation across cosmic time. Evidence for this origin comes from the presence of…
View article: GRB 241105A: A test case for GRB classification and rapid r-process nucleosynthesis channels
GRB 241105A: A test case for GRB classification and rapid r-process nucleosynthesis channels Open
Gamma-ray bursts (GRBs) offer a powerful window to probe the progenitor systems responsible for the formation of heavy elements through the rapid neutron capture (r-) process, thanks to their exceptional luminosity, which allows them to be…
View article: The day-long, repeating GRB 250702BDE / EP250702a: A unique extragalactic transient
The day-long, repeating GRB 250702BDE / EP250702a: A unique extragalactic transient Open
Gamma-ray bursts (GRBs) are singular outbursts of high-energy radiation with durations typically lasting from milliseconds to minutes and, in extreme cases, a few hours. They are attributed to the catastrophic outcomes of stellar-scale eve…
View article: EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow
EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow Open
We present multiband observations and analysis of EP240801a, a low-energy, extremely soft gamma-ray burst (GRB) discovered on 2024 August 1 by the Einstein Probe (EP) satellite with a weak contemporaneous signal also detected by the Fermi …
View article: EP 250108a/SN 2025kg: Observations of the Most Nearby Broad-line Type Ic Supernova Following an Einstein Probe Fast X-Ray Transient
EP 250108a/SN 2025kg: Observations of the Most Nearby Broad-line Type Ic Supernova Following an Einstein Probe Fast X-Ray Transient Open
With a small sample of fast X-ray transients (FXTs) with multiwavelength counterparts discovered to date, their progenitors and connections to γ -ray bursts (GRBs) and supernovae (SNe) remain ambiguous. Here, we present photometric and spe…
View article: The Kangaroo’s First Hop: The Early Fast Cooling Phase of EP250108a/SN 2025kg
The Kangaroo’s First Hop: The Early Fast Cooling Phase of EP250108a/SN 2025kg Open
Fast X-ray transients are a rare and poorly understood population of events. Previously difficult to detect in real time, the launch of the Einstein Probe with its Wide-field X-ray Telescope has led to a rapid expansionof the sample and al…
View article: First joint absorption and <i>Te</i>-based metallicity measured in a GRB host galaxy at <i>z</i> = 4.28 using <i>JWST</i>/NIRSpec
First joint absorption and <i>Te</i>-based metallicity measured in a GRB host galaxy at <i>z</i> = 4.28 using <i>JWST</i>/NIRSpec Open
We present the first gamma-ray burst (GRB) host galaxy with a measured absorption line and electron temperature (T$_e$) based metallicity, using the temperature sensitive [O iii]$\lambda$4363 auroral line detected in the JWST/NIRSpec spect…
View article: A large, chemically enriched, neutral gas reservoir in a galaxy at z = 6.782
A large, chemically enriched, neutral gas reservoir in a galaxy at z = 6.782 Open
The chemical characterization of galaxies in the first billion years after the Big Bang is one of the central goals of current astrophysics. Optical/near-infrared spectroscopy of long gamma-ray bursts (GRBs) have been heralded as an effect…
View article: First IFU observations of two GRB host galaxies at cosmic noon with <i>JWST</i>/NIRSpec
First IFU observations of two GRB host galaxies at cosmic noon with <i>JWST</i>/NIRSpec Open
Long gamma-ray bursts (GRBs) serve as powerful probes of distant galaxies. Their luminous afterglow pinpoints galaxies independent of luminosity, in contrast to most flux-limited surveys. Nevertheless, GRB-selected galaxy samples are not f…
View article: The Einstein Probe Transient EP240414a: Linking Fast X-Ray Transients, Gamma-Ray Bursts, and Luminous Fast Blue Optical Transients
The Einstein Probe Transient EP240414a: Linking Fast X-Ray Transients, Gamma-Ray Bursts, and Luminous Fast Blue Optical Transients Open
Detections of fast X-ray transients (FXTs) have accrued over the last few decades. However, their origin has remained mysterious. Rapid progress is now being made thanks to timely discoveries and localizations with the Einstein Probe missi…
View article: A comprehensive broadband analysis of the high-redshift GRB 240218A
A comprehensive broadband analysis of the high-redshift GRB 240218A Open
Context. The detection and follow-up observations of high-redshift ( z > 6) gamma-ray bursts (GRBs) provide a unique opportunity to explore the properties of the distant Universe. Unfortunately, they are rather rare, with only a dozen of t…
View article: The brightest GRB ever detected: GRB 221009A as a highly luminous event at <i>z</i> = 0.151
The brightest GRB ever detected: GRB 221009A as a highly luminous event at <i>z</i> = 0.151 Open
Context. The extreme luminosity of gamma-ray bursts (GRBs) makes them powerful beacons, thus effective probes of the distant Universe. The most luminous bursts are typically detected at moderate and high redshift, where the volume for seei…
View article: Neutral fraction of hydrogen in the intergalactic medium surrounding high-redshift gamma-ray burst 210905A
Neutral fraction of hydrogen in the intergalactic medium surrounding high-redshift gamma-ray burst 210905A Open
The Epoch of Reionization (EoR) is a key period of cosmological history in which the intergalactic medium (IGM) underwent a major phase change from being neutral to almost completely ionized. Gamma-ray bursts (GRBs) are luminous and unique…
View article: Varying linear polarisation in the dust-free gamma-ray burst 210610B
Varying linear polarisation in the dust-free gamma-ray burst 210610B Open
Context. Long gamma-ray bursts (GRBs) are produced by the collapse of some very massive stars, that emit ultra-relativistic jets. When the jets collide with the interstellar medium they decelerate and generate the so-called afterglow emiss…
View article: Rapid Response Mode observations of GRB 160203A: Looking for fine-structure line variability at <i>z</i> = 3.52
Rapid Response Mode observations of GRB 160203A: Looking for fine-structure line variability at <i>z</i> = 3.52 Open
Context . Gamma-ray bursts are the most energetic known explosions. Although they fade rapidly, they give us the opportunity to measure redshift and important properties of their host galaxies. We report the photometric and spectroscopic s…
View article: The host of GRB 171205A in 3D
The host of GRB 171205A in 3D Open
Long GRB hosts at z < 1 are usually low-mass, low-metallicity star-forming galaxies. Here we present the most detailed, spatially resolved study of the host of GRB 171205A so far, a grand-design barred spiral galaxy at z = 0.036. Our analy…
View article: The host of GRB 171205A in 3D -- A resolved multiwavelength study of a rare grand-design spiral GRB host
The host of GRB 171205A in 3D -- A resolved multiwavelength study of a rare grand-design spiral GRB host Open
Long GRB hosts at z<1 are usually low-mass, low metallicity star-forming galaxies. Here we present the until now most detailed, spatially resolved study of the host of GRB 171205A, a grand-design barred spiral galaxy at z=0.036. Our analys…
View article: A Hubble Space Telescope Search for r-Process Nucleosynthesis in Gamma-Ray Burst Supernovae
A Hubble Space Telescope Search for r-Process Nucleosynthesis in Gamma-Ray Burst Supernovae Open
The existence of a secondary (in addition to compact object mergers) source of heavy element ( r -process) nucleosynthesis, the core-collapse of rapidly rotating and highly magnetized massive stars, has been suggested by both simulations a…
View article: Correction to: Comparing emission- and absorption-based gas-phase metallicities in GRB host galaxies at <i>z</i> = 2−4 using JWST
Correction to: Comparing emission- and absorption-based gas-phase metallicities in GRB host galaxies at <i>z</i> = 2−4 using JWST Open
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