G. Cusumano
A5080948405- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- SAS software applications and methods
- Particle Detector Development and Performance
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Stellar, planetary, and galactic studies
- High-pressure geophysics and materials
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Radio Astronomy Observations and Technology
- Particle Accelerators and Free-Electron Lasers
- Galaxies: Formation, Evolution, Phenomena
- Calibration and Measurement Techniques
- Neutrino Physics Research
- Mechanics and Biomechanics Studies
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
- Inertial Sensor and Navigation
National Institute for Astrophysics
2014-2024
Istituto di Astrofisica Spaziale e Fisica cosmica di Palermo
2013-2023
Istituto di Radioastronomia di Bologna
2022
Brera Astronomical Observatory
2005-2022
University of Oxford
2019
Hypertension Institute
2017
University of Palermo
1974-2017
Centrum Badań Kosmicznych
2016
Institute for Space Astrophysics and Planetology
2006-2016
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2008-2016
We present new observations of the early X-ray afterglows first 27 gamma-ray bursts (GRBs) well observed by Swift X-Ray Telescope (XRT). The show a canonical behavior, where light curve broadly consists three distinct power-law segments: (1) an initial very steep decay (∝t-α with 3 ≲ α1 5), followed (2) shallow (0.5 α2 1.0), and finally (3) somewhat steeper (1 α3 1.5). These segments are separated two corresponding break times, tbreak,1 500 s 103 tbreak,2 104 s. On top this many events have...
Gamma-ray burst (GRB) afterglows have provided important clues to the nature of these massive explosive events, providing direct information on nearby environment and indirect central engine that powers burst. We report discovery two bright x-ray flares in GRB afterglows, including a giant flare comparable total energy itself, each peaking minutes after These strong, rapid imply engines bursts long periods activity, with strong internal shocks continuing for hundreds seconds gamma-ray...
With the first direct detection of merging black holes in 2015, era gravitational wave (GW) astrophysics began. A complete picture compact object mergers, however, requires an electromagnetic (EM) counterpart. We report ultraviolet (UV) and X-ray observations by Swift Nuclear Spectroscopic Telescope ARray (NuSTAR) EM counterpart binary neutron star merger GW170817. The bright, rapidly fading emission indicates a high mass ($\approx0.03$ solar masses) wind-driven outflow with moderate...
The scientific instrumentation on board the X-ray Astronomy Satellite BeppoSAX includes a Medium Energy Concentrator Spectrometer (MECS), operating in energy range keV, which consists of three units, each composed grazing incidence Mirror Unit and position sensitive Gas Scintillation Proportional Counter. design performance MECS instrument are here described, together with its on-ground calibration.
We present the catalog of sources detected in first 22 months data from hard X-ray survey (14--195 keV) conducted with BAT coded mask imager on \swift satellite. The contains 461 above 4.8 sigma level BAT. High angular resolution for every source Swift XRT or archival have allowed associations to be made known counterparts other wavelength bands over 97% detections, including discovery ~30 galaxies previously unknown as AGN and several new Galactic sources. A total 266 are associated Seyfert...
We present the first systematic investigation of morphological and timing properties flares in GRBs observed by Swift XRT. consider a large sample drawn from all detected Swift, INTEGRAL, HETE-2 prior to 2006 January 31, which had an XRT follow-up showed significant flaring. Our 33 includes long short, at low high redshift, total 69 flares. The strongest occur early phases, with clear anticorrelation between flare peak intensity time occurrence. Fitting each X-ray Gaussian model, we find...
We present observations of GRB 060124, the first event for which both prompt and afterglow emission could be observed simultaneously in their entirety by three Swift instruments. Indeed, Swift-BAT triggered on a precursor ~570s before main burst peak, this allowed to repoint narrow field instruments position ~350s occurred. 060124 also Konus-Wind, harder gamma-ray band (up 2MeV). Thanks these exceptional circumstances, temporal spectral properties can studied optical, X-ray ranges. While...
We present the time-averaged characteristics of Crab pulsar in 0.75-30 MeV energy window using data from imaging Compton Telescope COMPTEL aboard Gamma-Ray Observatory (CGRO) collected over its 9 year mission. Exploiting exceptionally long exposure on allowed us to derive significantly improved spectra for nebula and emissions, first time accurately determine at low-energy γ-rays pulse profile as a function energy. These timing data, showing well-known main second phase separation ~ with...
We present a detailed analysis of Swift multi-wavelength observations GRB 070110 and its remarkable afterglow. The early X-ray light curve, interpreted as the tail prompt emission, displays spectral evolution already seen in other gamma-ray bursts. optical afterglow shows shallow decay up to ~2 d after burst, which is not consistent with standard models. most intriguing feature very steep flux at ~20 ks ending an apparent plateau. abrupt drop curve rules out external shock origin plateau...
The <i>Swift</i> X-ray Telescope (XRT) is designed to make astrometric, spectroscopic, and photometric observations of emission from Gamma-ray Bursts their afterglows in the energy band 0.2-10 keV. In order provide rapid-response, automated these randomly occurring objects without ground intervention, XRT must be able observe covering some seven orders magnitude flux, extracting maximum possible science each one. This requires a variety readout modes optimise information collected response...
We use a nearly complete sample of gamma-ray bursts (GRBs) detected by the Swift satellite to study correlations between spectral peak energy Epeak prompt emission, isotropic energetics Eiso and luminosity Liso. This GRB is characterized high level completeness in redshift (90 per cent). allows us probe an unbiased way issue related physical origin these against selection effects. find that one burst, 061021, outlier Epeak–Eiso correlation. Despite this case, we strong Epeak–Liso for sample....
Aims. We present the Second Palermo Swift-BAT hard X-ray catalogue obtained by analysing data acquired in first 54 months of Swift mission.
We present the Second Palermo Swift-BAT hard X-ray catalogue obtained by analysing data acquired in first 54 months of Swift mission. Using our software dedicated to analysis from coded mask telescopes, we analysed BAT survey three energy bands (15-30 keV, 15-70 15-150 keV), obtaining a list 1256 detections above significance threshold 4.8 standard deviations. The identification source counterparts is pursued using two strategies: field observations soft instruments and cross-correlation...