A5066455210- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- SAS software applications and methods
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- High-pressure geophysics and materials
- Adaptive optics and wavefront sensing
- Particle physics theoretical and experimental studies
- Spectroscopy and Chemometric Analyses
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Calibration and Measurement Techniques
- Nuclear Physics and Applications
National Institute for Astrophysics
2015-2024
Brera Astronomical Observatory
2015-2024
Centro Brasileiro de Pesquisas Físicas
2017-2024
Ospedale Monaldi
2023-2024
Sapienza University of Rome
2024
University of Siena
2017-2023
University of Turku
2023
Foundation for Research and Technology Hellas
2023
Boston University
2023
University of Insubria
2007-2023
Abstract We report the discovery and monitoring of near-infrared counterpart (AT2017gfo) a binary neutron-star merger event detected as gravitational wave source by Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo (GW170817) short gamma-ray burst Fermi Gamma-ray Burst Monitor (GBM) Integral SPI-ACS (GRB 170817A). The evolution transient light is consistent with predictions for behavior “kilonova/macronova” powered radioactive decay massive neutron-rich nuclides...
The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at distance more than 5 billion light-years (a redshift 0.536). No quasar been observed previously in radiation, and this is also most object emitting above 50 gigaelectron volts. Because high-energy may be stopped by interacting with diffuse background light universe,...
We present the first joint analysis of gamma-ray data from MAGIC Cherenkov telescopes and Fermi Large Area Telescope (LAT) to search for signals dark matter annihilation in dwarf satellite galaxies. combine 158 hours Segue 1 observations with 6-year 15 galaxies by -LAT. obtain limits on cross-section particle masses between 10 GeV 100 TeV—the widest mass range ever explored a single analysis. These improve previously published -LAT results up factor two at certain masses. Our new inclusive...
Very high energy (VHE) γ-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+21 (4C 21.35, z = 0.432) was detected with MAGIC Cherenkov telescopes during a short observation (∼0.5 hr) performed on 2010 June 17. The detection coincides high-energy MeV/GeV activity measured by Large Area Telescope (LAT) board Fermi satellite. VHE extends about 70 GeV up to at least 400 and can be well described power-law dN/dE ∝ E−Γ photon index Γ 3.75 ± 0.27stat 0.2syst. averaged integral flux...
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...
We present comprehensive multiwavelength observations of three gamma-ray bursts (GRBs) with durations several thousand seconds. demonstrate that these events are extragalactic transients; in particular we resolve the long-standing conundrum distance GRB 101225A (the "Christmas-day burst"), finding it to have a redshift z=0.847, and showing two apparently similar (GRB 111209A 121027A) lie at z=0.677 z=1.773 respectively. The systems show extremely unusual X-ray optical lightcurves, very...
Abstract Long-duration (>2 s) γ-ray bursts that are believed to originate from the death of massive stars expected be accompanied by supernovae. GRB 060614, lasted 102 s, lacks a supernova-like emission down very stringent limits and its physical origin is still debated. Here we report discovery near-infrared bump significantly above regular decaying afterglow. This red inconsistent with even weakest known supernova. However, it can arise Li-Paczyński macronova—the radioactive decay...
Gamma-ray bursts (GRBs) have been separated into two classes, originally along the lines of duration and spectral properties, called "short/hard" "long/soft." The latter conclusively linked to explosive deaths massive stars, while former are thought result from merger or collapse compact objects. In recent years, indications accumulating that short/hard versus long/soft division does not map directly onto what would be expected classes progenitors, leading a new classification scheme Type I...
Abstract GRB 050709 was the first short Gamma-ray Burst (sGRB) with an identified optical counterpart. Here we report a reanalysis of publicly available data this event and discovery Li-Paczynski macronova/kilonova that dominates optical/infrared signal at t >2.5 days. Such would arise from 0.05 "Equation missing" r-process material launched by compact binary merger. The implied mass ejection supports suggestion mergers are significant possibly main sites heavy nucleosynthesis....
Abstract A neutrino with energy ∼290 TeV, IceCube-170922A, was detected in coincidence the BL Lac object TXS 0506+056 during enhanced gamma-ray activity, chance being rejected at ∼3 σ level. We monitored very-high-energy (VHE) band Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes for ∼41 hr from 1.3 to 40.4 days after detection. Day-timescale variability is clearly resolved. interpret quasi-simultaneous and broadband electromagnetic observations a novel one-zone...
The {\it Swift}-detected GRB 060614 was a unique burst that straddles an imaginary divide between long- and short-duration gamma-ray bursts (GRBs), its physical origin has been heavily debated over the years. Recently, distinct very-soft F814W-band excess at $t\sim 13.6$ days after identified in joint-analysis of VLT HST optical afterglow data GRB~060614, which interpreted as evidence for accompanying Li-Paczynski macronova (also called kilonova). Under assumption time interval $1.7-3.0$ are...