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View article: GRB 250702B: discovery of a gamma-ray burst from a black hole falling into a star
GRB 250702B: discovery of a gamma-ray burst from a black hole falling into a star Open
Gamma-ray bursts are the most luminous electromagnetic events in the Universe. Their prompt gamma-ray emission has typical durations between a fraction of a second and several minutes. A rare subset of these events have durations in excess…
View article: GRB 250702B: Discovery of a Gamma-Ray Burst from a Black Hole Falling into a Star
GRB 250702B: Discovery of a Gamma-Ray Burst from a Black Hole Falling into a Star Open
Gamma-ray bursts are the most luminous electromagnetic events in the universe. Their prompt gamma-ray emission has typical durations between a fraction of a second and several minutes. A rare subset of these events have durations in excess…
View article: Time-resolved spectro-polarimetric analysis of extremely bright GRB 230307A: Possible evidence of evolution from photospheric to synchrotron dominated emission
Time-resolved spectro-polarimetric analysis of extremely bright GRB 230307A: Possible evidence of evolution from photospheric to synchrotron dominated emission Open
Context. The radiation mechanisms powering gamma-ray bursts (GRBs) and their physical processes remain one of the unresolved questions in high-energy astrophysics. Spectro-polarimetric observations of exceptionally bright GRBs provide a po…
View article: Time-resolved spectro-polarimetric analysis of extremely bright GRB 230307A: Possible Evidence of evolution from photospheric to synchrotron dominated emission
Time-resolved spectro-polarimetric analysis of extremely bright GRB 230307A: Possible Evidence of evolution from photospheric to synchrotron dominated emission Open
The radiation mechanisms powering Gamma-ray bursts (GRBs) and their physical processes remain one of the unresolved questions in high-energy astrophysics. Spectro-polarimetric observations of exceptionally bright GRBs provide a powerful di…
View article: Multiwavelength analysis of AT 2023sva: a luminous orphan afterglow with evidence for a structured jet
Multiwavelength analysis of AT 2023sva: a luminous orphan afterglow with evidence for a structured jet Open
We present multiwavelength analysis of ZTF23abelseb (AT 2023sva), an optically discovered fast-fading ($\Delta m_r = 2.2$ mag in $\Delta t = 0.74$ d), luminous ($M_r \sim -30.0$ mag), and red ($g-r = 0.50$ mag) transient at $z = 2.28$ with…
View article: The luminous, slow-rising orphan afterglow AT2019pim as a candidate moderately relativistic outflow
The luminous, slow-rising orphan afterglow AT2019pim as a candidate moderately relativistic outflow Open
Classical gamma-ray bursts (GRBs) have two distinct emission episodes: prompt emission from ultrarelativistic ejecta and afterglow from shocked circumstellar material. While both components are extremely luminous in known GRBs, a variety o…
View article: The third Konus-<i>Wind</i> catalogue of short gamma-ray bursts
The third Konus-<i>Wind</i> catalogue of short gamma-ray bursts Open
In this catalogue, we present the results of a systematic study of 199 short gamma-ray bursts (GRBs) detected by Konus- Wind between 1 January 2011 and 31 August 2021. The catalogue extends the Second Catalogue of short GRBs covering the p…
View article: Extragalactic fast X-ray transient from a weak relativistic jet associated with a Type Ic-BL supernova
Extragalactic fast X-ray transient from a weak relativistic jet associated with a Type Ic-BL supernova Open
Massive stars end their life as core-collapse supernovae, amongst which some extremes are Type Ic broad-lined supernovae associated with long-duration gamma-ray bursts (LGRBs) having powerful relativistic jets. Their less-extreme brethren …
View article: Investigating Polarization characteristics of GRB200503A and GRB201009A
Investigating Polarization characteristics of GRB200503A and GRB201009A Open
We present results of a comprehensive analysis of the polarization characteristics of GRB 200503A and GRB 201009A observed with the Cadmium Zinc Telluride Imager (CZTI) on board AstroSat. Despite these GRBs being reasonably bright, they we…
View article: The Third Konus-Wind Catalog of Short Gamma-Ray bursts
The Third Konus-Wind Catalog of Short Gamma-Ray bursts Open
In this catalog, we present the results of a systematic study of 199 short gamma-ray bursts (GRBs) detected by Konus-Wind between 2011 January 1 and 2021 August 31. The catalog extends the Second Catalog of short gamma-ray bursts covering …
View article: New results on the gamma-ray burst variability-luminosity relation
New results on the gamma-ray burst variability-luminosity relation Open
At the dawn of the gamma-ray burst (GRB) afterglow era, a Cepheid-like correlation was discovered between time variability V and isotropic-equivalent peak luminosity Liso of the prompt emission of about a dozen long GRBs with measured reds…
View article: New results on the gamma-ray burst variability–luminosity relation
New results on the gamma-ray burst variability–luminosity relation Open
Context. At the dawn of the gamma–ray burst (GRB) afterglow era, a Cepheid-like correlation was discovered between the time variability V and the isotropic-equivalent peak luminosity L iso of the prompt emission of about a dozen long GRBs …
View article: GRB 180128A: A second magnetar giant flare candidate from the Sculptor Galaxy
GRB 180128A: A second magnetar giant flare candidate from the Sculptor Galaxy Open
Magnetars are slowly rotating neutron stars that possess the strongest magnetic fields known in the cosmos (10 14 − 10 15 G). They display a range of transient high-energy electromagnetic activity. The brightest and most energetic of these…
View article: Soft X-ray prompt emission from a high-redshift gamma-ray burst EP240315a
Soft X-ray prompt emission from a high-redshift gamma-ray burst EP240315a Open
Long gamma-ray bursts (GRBs) are believed to originate from core collapse of massive stars. High-redshift GRBs can probe the star formation and reionization history of the early universe, but their detection remains rare. Here we report th…
View article: The Luminous, Slow-Rising Orphan Afterglow AT2019pim as a Candidate Moderately Relativistic Outflow
The Luminous, Slow-Rising Orphan Afterglow AT2019pim as a Candidate Moderately Relativistic Outflow Open
Classical gamma-ray bursts (GRBs) have two distinct emission episodes: prompt emission from ultrarelativistic ejecta and afterglow from shocked circumstellar material. While both components are extremely luminous in known GRBs, a variety o…
View article: A targeted search for FRB counterparts with Konus-<i>Wind</i>
A targeted search for FRB counterparts with Konus-<i>Wind</i> Open
We present results of the search for hard X-ray/soft gamma-ray emission in coincidence with publicly reported (via Transient Name Server, TNS1) fast radio bursts (FRBs). The search was carried out using continuous Konus-Wind data with 2.94…
View article: GRB 180128A: A Second Magnetar Giant Flare Candidate from the Sculptor Galaxy
GRB 180128A: A Second Magnetar Giant Flare Candidate from the Sculptor Galaxy Open
Magnetars are slowly rotating neutron stars that possess the strongest magnetic fields ($10^{14}-10^{15} \mathrm{G}$) known in the cosmos. They display a range of transient high-energy electromagnetic activity. The brightest and most energ…
View article: Properties of the Extremely Energetic GRB 221009A from Konus-WIND and SRG/ART-XC Observations
Properties of the Extremely Energetic GRB 221009A from Konus-WIND and SRG/ART-XC Observations Open
We report on Konus-WIND (KW) and Mikhail Pavlinsky Astronomical Roentgen Telescope – X-ray Concentrator (ART-XC) observations and analysis of a nearby GRB 221009A, the brightest γ -ray burst (GRB) detected by KW for >28 yr of observations.…
View article: GRB 221009A: The BOAT
GRB 221009A: The BOAT Open
GRB 221009A has been referred to as the brightest of all time (BOAT). We investigate the veracity of this statement by comparing it with a half century of prompt gamma-ray burst observations. This burst is the brightest ever detected by th…
View article: GRB 221009A, The BOAT
GRB 221009A, The BOAT Open
GRB 221009A has been referred to as the Brightest Of All Time (the BOAT). We investigate the veracity of this statement by comparing it with a half century of prompt gamma-ray burst observations. This burst is the brightest ever detected b…
View article: Cosmological Fast Optical Transients with the Zwicky Transient Facility: A Search for Dirty Fireballs
Cosmological Fast Optical Transients with the Zwicky Transient Facility: A Search for Dirty Fireballs Open
Dirty fireballs are a hypothesized class of relativistic massive-star explosions with an initial Lorentz factor Γ init below the Γ init ∼ 100 required to produce a long-duration gamma-ray burst (LGRB), but which could still produce optical…
View article: The Second Catalog of Interplanetary Network Localizations of Konus Short-duration Gamma-Ray Bursts
The Second Catalog of Interplanetary Network Localizations of Konus Short-duration Gamma-Ray Bursts Open
We present the catalog of InterPlanetary Network (IPN) localizations for 199 short-duration gamma-ray bursts (sGRBs) detected by the Konus-Wind (KW) experiment between 2011 January 1 and 2021 August 31, which extends the initial sample of …
View article: Cosmological Fast Optical Transients with the Zwicky Transient Facility: A Search for Dirty Fireballs
Cosmological Fast Optical Transients with the Zwicky Transient Facility: A Search for Dirty Fireballs Open
Dirty fireballs are a hypothesized class of relativistic massive-star explosions with an initial Lorentz factor $Γ_\mathrm{init}$ below the $Γ_\mathrm{init}\sim100$ required to produce a long-duration gamma-ray burst (LGRB), but which coul…
View article: The Konus–Wind Catalog of Gamma-Ray Bursts with Known Redshifts. II. Waiting-Mode Bursts Simultaneously Detected by Swift/BAT
The Konus–Wind Catalog of Gamma-Ray Bursts with Known Redshifts. II. Waiting-Mode Bursts Simultaneously Detected by Swift/BAT Open
In the second part of The Konus–Wind Catalog of Gamma-Ray Bursts with Known Redshifts (the first part: Tsvetkova et al. 2017; T17), we present the results of a systematic study of gamma-ray bursts (GRBs) with reliable redshift estimates de…
View article: Identification of a Local Sample of Gamma-Ray Bursts Consistent with a Magnetar Giant Flare Origin
Identification of a Local Sample of Gamma-Ray Bursts Consistent with a Magnetar Giant Flare Origin Open
Cosmological Gamma-Ray Bursts (GRBs) are known to arise from distinct progenitor channels: short GRBs mostly from neutron star mergers and long GRBs from a rare type of core-collapse supernova (CCSN) called collapsars. Highly magnetized ne…
View article: X-Ray and Radio Bursts from the Magnetar 1E 1547.0–5408
X-Ray and Radio Bursts from the Magnetar 1E 1547.0–5408 Open
We report on simultaneous radio and X-ray observations of the radio-emitting magnetar 1E 1547.0–5408 on 2009 January 25 and February 3, with the 64 m Parkes radio telescope and the Chandra and XMM-Newton X-ray observatories. The magnetar w…