E. Palazzi
A5085670376- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- SAS software applications and methods
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Galaxies: Formation, Evolution, Phenomena
- Particle Detector Development and Performance
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Nuclear Physics and Applications
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Spectroscopy and Chemometric Analyses
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Atmospheric Ozone and Climate
- High-pressure geophysics and materials
- X-ray Spectroscopy and Fluorescence Analysis
- Dark Matter and Cosmic Phenomena
- Spectroscopy and Laser Applications
National Institute for Astrophysics
2015-2024
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2010-2024
Osservatorio di Astrofisica e Scienza dello Spazio
2018-2024
AIAS Bologna
2023
CTA Observatory
2021
Space (Italy)
2007-2018
Centrum Badań Kosmicznych
2018
Polish Academy of Sciences
2018
Istanbul University
2018
Campbell Collaboration
2015
We present the main results of a study spectral and energetics properties twelve gamma-ray bursts (GRBs) with redshift estimates. All GRBs in our sample were detected by BeppoSAX broad energy range (2–700 ). From estimates good-quality time–integrated spectra we deduce their cosmological rest frames. are satisfactorily represented Band model, no significant soft X–ray excesses or absorptions. find positive correlation between estimated total (isotropic) energies 1–10 000 (Erad) redshifts z....
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...
(Abridged). We present a sample of 77 optical afterglows (OAs) Swift detected GRBs for which spectroscopic follow-up observations have been secured. provide linelists and equivalent widths all lines redward Ly-alpha. discuss to what extent the current bursts with OA spectroscopy is biased subsample GRBs. For that purpose we define an X-ray selected optimal conditions ground-based follow up from period March 2005 September 2008; 146 fulfill our criteria. derive redshift distribution this...
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 present and discuss the photometric spectroscopic evolution of peculiar SN 1998bw, associated with GRB 980425, through an analysis optical near-IR data collected at ESO-La Silla. The data, spanning period from day -9 to +376 (relative B maximum), have shown that this supernova (SN) was unprecedented, although somewhat similar 1997ef. Maximum expansion velocities as high 3 × 104 km s-1 some extent mask its resemblance other Type Ic SNe. At intermediate phases, between photospheric fully...
BeppoSAX/PDS experiment is one of four narrow field instruments the BeppoSAX payload, that also includes two wide cameras. The goal PDS to extend energy range hard X–rays. operative 15 300 keV, where can perform sensitive spectral and temporal studies celestial sources. detector composed 4 actively shielded NaI(Tl)/CsI(Na) phoswich scintillators with a total geometric area view 13 (FWHM). In this paper we describe design discuss its functional performance calibration data analysis system.
The BL Lacertae object Markarian 501, one of only three extragalactic sources (with Mrk 421 and 1ES 2344+514) so far detected at TeV energies, was observed with the BeppoSAX satellite in 1997 April 7, 11, 16 during a phase high activity as monitored Whipple, HEGRA, CAT Cherenkov telescopes. Over whole 0.1-200 keV range, spectrum exceptionally hard (α≤1, Fν ∝ ν−α), indicating that X-ray power output peaked (or above) ~100 keV. This represents shift least 2 orders magnitude respect to previous...
Gamma-ray burst (GRB) emission is believed to originate in highly relativistic fireballs. Currently, only lower limits were securely set the initial fireball Lorentz factor Gamma_0. We aim provide a direct measure of The early-time afterglow light curve carries information about Gamma_0, which determines time peak. have obtained early observations near-infrared afterglows GRB 060418 and 060607A with REM robotic telescope. For both events, peak could be clearly singled out, allowing firm...
The only supernovae (SNe) to show gamma-ray bursts (GRBs) or early x-ray emission thus far are overenergetic, broad-lined type Ic SNe (hypernovae, HNe). Recently, SN 2008D has shown several unusual features: (i) weak flash (XRF), (ii) an early, narrow optical peak, (iii) disappearance of the broad lines typical HNe, and (iv) development helium as in Ib. Detailed analysis shows that was not a normal supernova: Its explosion energy (E approximately 6x10(51) erg) ejected mass [ 7 times Sun...
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...
Abstract We present Hubble Space Telescope ( HST ) and Chandra imaging, combined with Very Large MUSE integral field spectroscopy of the counterpart host galaxy first binary neutron star merger detected via gravitational-wave emission by LIGO Virgo, GW170817. The galaxy, NGC 4993, is an S0 at z = 0.009783. There evidence for large, face-on spiral shells in continuum edge-on features visible nebular lines. This suggests that 4993 has undergone a relatively recent <mml:math...
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 Monitoring of vibrational eigenmodes an elastic body excited by gravitational waves was one the first concepts proposed for detection waves. At laboratory scale, these experiments became known as resonant bar detectors developed Joseph Weber in 1960s. Due to dimensions bars, targeted signal frequencies were kHz range. also pointed out that monitoring vibrations Earth or Moon could reveal mHz band. His Lunar Surface Gravimeter experiment deployed on Apollo 17 crew had a technical...