A5000627504- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- SAS software applications and methods
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Fermentation and Sensory Analysis
- Astronomy and Astrophysical Research
- Horticultural and Viticultural Research
- Stellar, planetary, and galactic studies
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Galaxies: Formation, Evolution, Phenomena
- Wine Industry and Tourism
- Fungal and yeast genetics research
- Neutrino Physics Research
- Yeasts and Rust Fungi Studies
- Mechanics and Biomechanics Studies
- Food Quality and Safety Studies
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
Brera Astronomical Observatory
2008-2024
University of Basilicata
2013-2024
Mercatorum University
2021-2024
Stazione Zoologica Anton Dohrn
2024
University of Siena
2023-2024
National Institute for Astrophysics
2010-2023
Durham University
2023
TU Dortmund University
2023
University of Łódź
2023
Heidelberg University
2023
We present a homogeneous X-ray analysis of all 318 gamma-ray bursts detected by the telescope (XRT) on Swift satellite up to 2008 July 23; this represents largest sample GRB data published date. In Sections 2–3, we detail methods which Swift-XRT team has developed produce enhanced positions, light curves, hardness ratios and spectra presented in paper. Software using these continues create such products for new GRBs observed Swift-XRT. also web-based tools allowing users any object XRT, not...
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...
Context.Swift data are revolutionising our understanding of Gamma Ray Bursts. Since bursts fade rapidly, it is desirable to create and disseminate accurate light curves rapidly.
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...
The Swift/Burst Alert Telescope (BAT) hard X-ray transient monitor provides near real-time coverage of the sky in energy range 15-50 keV. BAT observes 88% each day with a detection sensitivity 5.3 mCrab for full-day observation and time resolution as fine 64 seconds. three main purposes are (1) discovery new sources, (2) outbursts or other changes flux known (3) generation light curves more than 900 sources spanning over eight years. primary interface is public web page. Between 2005...
Optical and near-infrared observations of the gamma-ray burst GRB 031203, at z = 0.1055, are reported. A very faint afterglow is detected superposed onto host galaxy in our first infrared JHK observations, carried out ~9 hr after burst. Subsequently, a rebrightening all bands, peaking R band about 18 rest-frame days The closely resembles light curve supernova like SN 1998bw, assuming that went off almost simultaneously, but with somewhat slower evolution. Spectra taken close to maximum show...
Abstract We have analyzed by genetic means 43 strains of Saccharomyces that had been isolated from fermenting grape musts in Italy. Twenty eight these were 28 cellars the Region Emilia Romagna. The other 15 came 5 fermentations at four near city Arpino, which is located south and east Rome. found 20 Romagna heterozygous one to seven loci. balance were, within limits our detection, completely homozygous. All appeared be diploid most homozygous for homothallism gene (HO/HO). Spore viability...
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 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 flavor of alcoholic beverages is produced by a very large number compounds (50). Among these, acetoin important because its involvement in the bouquet wine, and it key compound biosynthesis 2,3-butanediol diacetyl. These two are closely related to acetoin, representing three levels oxidation one four-carbon skeleton (8). Their contribution aroma wine not easily assessed. Neither nor strongly odorous; fact, their threshold values high, both being about 150 mg/liter (19, 72); however,...
We have conducted a multiwavelength survey of 42 radio loud narrow-1ine Seyfert 1 galaxies (RLNLS1s), selected by searching among all the known sources this type and omitting those with steep spectra. analyse data from frequencies to X-rays, supplement these information available online catalogues literature in order cover full electromagnetic spectrum. This is largest for source. detected 90% X-rays found 17% at γ rays. Extreme variability high energies was also found, down timescales as...
Context: Gamma Ray Burst models predict the broadband spectral evolution and temporal of energy flux. In contrast, standard data analysis tools repositories provide count-rate data, or use single flux conversion factors for all neglecting evolution. Aims: To produce Swift BAT XRT light curves in units, where is accounted for. Methods: We have developed software to hardness ratio information track GRBs, thus convert from instruments on into accurate, evolution-aware curves. Results: The...
We present a comprehensive statistical analysis of Swift X-ray light curves gamma-ray bursts (GRBs) collecting data from more than 650 GRBs discovered by and other facilities. The unprecedented sample size allows us to constrain the rest-frame properties perspective, with particular reference intrinsic time-scales energetics different light-curve phases in common 0.3–30 keV energy band. Temporal variability episodes are also studied their constrained. Two fundamental questions drive this...
Aims. We present the Second Palermo Swift-BAT hard X-ray catalogue obtained by analysing data acquired in first 54 months of Swift mission.