A5059563265- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- SAS software applications and methods
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Advanced MRI Techniques and Applications
- Mitochondrial Function and Pathology
- Cardiac Ischemia and Reperfusion
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
- Biochemical and Molecular Research
- Galaxies: Formation, Evolution, Phenomena
- Muscle metabolism and nutrition
- Astrophysics and Star Formation Studies
- Cardiovascular Function and Risk Factors
- Cardiac electrophysiology and arrhythmias
- Cardiovascular and exercise physiology
- Adipose Tissue and Metabolism
- Solar and Space Plasma Dynamics
- Biochemical effects in animals
- Metabolism and Genetic Disorders
National Institute for Astrophysics
2015-2024
Osservatorio di Astrofisica e Scienza dello Spazio
2018-2024
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2016-2024
Leonardo (United States)
2023
Space (Italy)
2023
Thales (Italy)
2023
University of Calabria
2023
Ioffe Institute
2023
Osservatorio Astrofisico di Catania
2022-2023
Université Joseph Fourier
1989-2020
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for total 76 GRBs, and present an additional three pre-Swift not included in earlier sample. Furthermore, we publish 840 new points 42 GRB afterglows, sets 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A 080810. analyzed light curves all derived spectral energy distributions with best quality, allowing us estimate host...
The mergers of binary compact objects such as neutron stars and black holes are central interest to several areas astrophysics, including the progenitors gamma-ray bursts (GRBs), sources high-frequency gravitational waves likely production sites for heavy element nucleosynthesis via rapid capture (the r-process). These elements include some great geophysical, biological cultural importance, thorium, iodine gold. Here we present observations exceptionally bright burst GRB 230307A. We show...
Abstract Gamma-ray bursts (GRBs) are classified into long and short events. Long GRBs (LGRBs) associated with the end states of very massive stars, while (SGRBs) linked to merger compact objects. GRB 200826A was a peculiar event, because by definition it an SGRB, rest-frame duration ∼0.5 s. However, this event energetic soft, which is consistent LGRBs. The relatively low redshift ( z = 0.7486) motivated comprehensive, multiwavelength follow-up campaign characterize its host, search for...
We report on the detection by Swift of GRB 080913, and subsequent optical/near-infrared follow-up observations GROND, which led to discovery its optical/NIR afterglow recognition high-z nature via a spectral break between i' z' bands. Spectroscopy obtained at ESO-VLT revealed continuum extending down λ = 9400 Å, zero flux for 7500 Å<λ < we interpret as onset Gunn–Peterson trough z 6.695± 0.025 (95.5% confidence level), making 080913 highest-redshift gamma-ray burst (GRB) date, more distant...
Context. Thirteen years after the discovery of first afterglows, nature dark gamma-ray bursts (GRB) still eludes explanation: while each long-duration GRB typically has an X-ray afterglow, optical/NIR emission is only seen for 40–60% them.
(Abridged) Until recently the information inferred from gamma-ray burst follow-up observations was mostly limited to optically bright afterglows, biasing all demographic studies against sight-lines that contain large amounts of dust. Here, we present GRB afterglow and host for a sample bursts are exemplary previously missed ones because high visual extinction along sight-line. This facilitates an investigation properties, geometry location absorbing dust these poorly-explored galaxies,...
We present time-resolved broad-band observations of the quasar 3C 279 obtained from multi-wavelength campaigns conducted during first two years Fermi Gamma-ray Space Telescope mission. While investigating previously reported gamma-ray/optical flare accompanied by a change in optical polarization, we found that emission appears delayed with respect to gamma-ray about 10 days. X-ray reveal pair `isolated' flares separated ~90 days, only weak counterparts. The spectral structure measured...
We present data and initial results from VLT/X-Shooter emission-line spectroscopy of 96 galaxies selected by long γ-ray bursts (GRBs) at 0.1 <z< 3.6, the largest sample GRB host spectra available to date. Most our GRBs were detected Swift 76% are 0.5 2.5 with a median zmed ~ 1.6. Based on Balmer and/or forbidden lines oxygen, nitrogen, neon, we measure systemic redshifts, star formation rates (SFR), visual attenuations (AV), oxygen abundances (12 + log (O/H)), widths (σ). study hosts up z...
Multimessenger observations of GW170817 have not conclusively established whether the merger remnant is a black hole (BH) or neutron star (NS). We show that long-lived magnetized NS with poloidal field B ≈ 1012 G fully consistent electromagnetic dataset, when spin-down losses are dominated by gravitational wave (GW) emission. The required ellipticity ε ≳ 10−5 can result from toroidal magnetic component much stronger than component, configuration expected an newly formed merger. Abrupt...
We have fit the far-ultraviolet (FUV) to sub-millimeter (850 micron) spectral energy distributions (SEDs) of 61 galaxies from "Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel" (KINGFISH). The fitting has been performed using three models: Code for Investigating GALaxy Evolution (CIGALE), GRAphite-SILicate approach (GRASIL), and Multi-wavelength Analysis Galaxy PHYSical properties (MAGPHYS). analyzed results codes in terms SED shapes, by comparing derived quantities...
Multi-messenger astronomy received a great boost following the discovery of kilonova AT2017gfo, optical counterpart gravitational wave source GW170817 associated with short gamma-ray burst GRB 170817A. AT2017gfo was first that could be extensively monitored in time both photometrically and spectroscopically. Previously, only few candidates have been observed against glare afterglows. In this work, we aim to search fingerprints AT2017gfo-like emissions optical/NIR light curves 39 GRBs known...
Abstract We present James Webb Space Telescope (JWST) and Hubble (HST) observations of the afterglow GRB 221009A, brightest gamma-ray burst (GRB) ever observed. This includes first mid-IR spectra any GRB, obtained with JWST/Near Infrared Spectrograph (0.6–5.5 micron) Mid-Infrared Instrument (5–12 micron), 12 days after burst. Assuming that intrinsic spectral slope is a single power law, F ν ∝ − β , we obtain ≈ 0.35, modified by substantial dust extinction A V = 4.9. suggests above notional...
Fermi can measure the spectral properties of gamma-ray bursts over a very large energy range and is opening new window on prompt emission these energetic events. Localizations by instruments in combination with follow-up Swift provide accurate positions for observations at longer wavelengths leading to determination redshifts, true budget, host galaxy facilitate comparison pre-Fermi bursts. Multi-wavelength were performed afterglows four high detected Fermi/LAT : GRB090323, GRB090328,...
Aims. With an observed and rest-frame duration of < 2s 0.5s, respectively, GRB090426 could be classified as a short GRB. The prompt detection, both from space ground-based telescopes, bright optical counterpart to this GRB offered unique opportunity complete detailed study. Methods. Based on extensive observational campaign, we obtained the spectrum afterglow GRB090426, measuring its redshift obtaining information about medium in which event took place. We completed follow-up observation...
The detection of GeV photons from gamma-ray bursts (GRBs) has important consequences for the interpretation and modelling these most-energetic cosmological explosions. full exploitation high-energy measurements relies, however, on accurate knowledge distance to events. Here we report discovery afterglow subsequent redshift determination GRB 080916C, first detected by Fermi Gamma-Ray Space Telescope with high significance at >0.1 GeV. Observations were done 7-channel imager GROND 2.2m...