G. Pugliese
A5018985974- Gamma-ray bursts and supernovae
- SAS software applications and methods
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Neutrino Physics Research
- Adaptive optics and wavefront sensing
- Pulsars and Gravitational Waves Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Spectroscopy and Chemometric Analyses
- Advanced X-ray and CT Imaging
- Advanced Image Processing Techniques
- Astrophysics and Star Formation Studies
- Methane Hydrates and Related Phenomena
- Optical Systems and Laser Technology
- Galaxies: Formation, Evolution, Phenomena
- History of Science and Medicine
- Radiation Therapy and Dosimetry
- History and Developments in Astronomy
- Isotope Analysis in Ecology
University of Amsterdam
2017-2024
Leiden University
2022
Leiden Observatory
2022
European Southern Observatory
2004-2005
University of California, Santa Cruz
2004
Max Planck Society
1999-2000
Max Planck Institute for Radio Astronomy
2000
Sapienza University of Rome
1998-1999
University of Pisa
1999
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
1998
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...
We present a measurement of the flux neutrino-induced upgoing muons (<Eν>∼ 100 GeV) using MACRO detector. The ratio number observed to expected events integrated over all zenith angles is 0.74 ±0.036 (stat) ±0.046 (systematic) ±0.13 (theoretical). distribution for −1.0≤cosθ≤−0.1 does not fit well with no oscillation expectation, giving maximum probability χ2 0.1%. acceptance detector has been extensively studied downgoing muons, independent analyses and Monte Carlo simulations. other...
Abstract We report our identification of the optical afterglow and host galaxy short-duration gamma-ray burst sGRB 160821B. The spectroscopic redshift is z = 0.162, making it one lowest bursts (sGRBs) identified by Swift . Our intensive follow-up campaign using a range ground-based facilities as well Hubble Space Telescope , XMM-Newton shows evidence for late-time excess near-infrared emission in addition to complex afterglow. light curve at X-ray frequencies reveals narrow jet, <?CDATA...
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...
Whether stars could have driven the reionization of intergalactic medium depends critically on proportion ionizing radiation that escapes galaxies in which it is produced. Spectroscopy gamma-ray burst (GRB) afterglows can be used to estimate opacity extreme ultraviolet (EUV) along lines-of-sight bursts. Assuming long-duration GRBs trace locations massive dominating EUV production, average escape fraction calculated independently galaxy size or luminosity. Here we present a compilation H i...
Context: The extreme luminosity of gamma-ray bursts (GRBs) makes them powerful beacons for studies the distant Universe. most luminous are typically detected at moderate/high redshift, where volume seeing such rare events is maximized and star-formation activity greater than z = 0. For events, not all observations feasible, as TeV energies. Aims: Here we present a spectroscopic redshift measurement exceptional GRB 221009A, brightest observed to date with emission extending well into regime....
Short Gamma-Ray Bursts (SGRBs) are produced by the coalescence of compact binary systems which remnants massive stars. GRB 160410A is classified as a short-duration with extended emission and currently farthest SGRB redshift determined from an afterglow spectrum also one brightest SGRBs to date. The fast reaction Neil Gehrels Swift Observatory alert allowed us obtain using X-shooter spectrograph at Very Large Telescope (VLT). shows several absorption features z=1.7177, in addition, we detect...
Context. GRB 220627A is a rare burst with two distinct γ -ray emission episodes separated by almost 1000 s that triggered the Fermi Gamma-ray Burst Monitor twice. High-energy GeV was detected Large Area Telescope coincident first episode but not second. The discovery of optical afterglow MeerLICHT led to MUSE observations which secured redshift z = 3.08, making this most distant ultra-long gamma-ray (GRB) date. Aims. progenitors some GRBs have been suggested in literature be different those...
Abstract The existence of a secondary (in addition to compact object mergers) source heavy element ( r -process) nucleosynthesis, the core-collapse rapidly rotating and highly magnetized massive stars, has been suggested by both simulations indirect observational evidence. Here, we probe predicted signature -process enrichment, late-time (≳40 days post-burst) distinct red color, in observations gamma-ray burst supernovae (GRB-SNe), which are linked these star progenitors. We present optical...
In this work we present spectra of all $γ$-ray burst (GRB) afterglows that have been promptly observed with the X-shooter spectrograph until 31-03-2017. total, obtained spectroscopic observations 103 individual GRBs within 48 hours GRB trigger. Redshifts measured for 97 per cent these, covering a redshift range from 0.059 to 7.84. Based on set observational selection criteria minimize biases regards intrinsic properties GRBs, follow-up effort has focused producing homogeneous sample 93...
It is notoriously difficult to localize short γ -ray bursts (sGRBs) and their hosts measure redshifts. These measurements, however, are critical for constraining the nature of sGRB progenitors, redshift distribution, r -process element enrichment history universe. Here we present spectroscopy host galaxy GRB 111117A its be z = 2.211. This makes most distant high-confidence duration detected date. Our spectroscopic supersedes a lower, previously estimated photometric value this burst. We use...
We present here a survey of high-ionization absorption lines in the afterglow spectra long-duration gamma-ray bursts (GRBs) obtained with VLT/X-shooter spectrograph. Our main goal is to investigate circumburst medium natal regions GRBs. primary focus on NV 1238,1242 line transitions, but we also discuss other such as OVI, CIV and SiIV. find no correlation between column density neutral gas properties metallicity, HI dust depletion, however relative velocity NV, typically blueshift respect...
The study of the properties galaxies in first billion years after Big Bang is one major topic current astrophysics. Optical/near-infrared spectroscopy afterglows long Gamma-ray bursts (GRBs) provide a powerful diagnostic tool to probe interstellar medium (ISM) their host and foreground absorbers, even up highest redshifts. We analyze VLT/X-shooter afterglow spectrum GRB 210905A, triggered by Swift Neil Gehrels Observatory, detect neutral-hydrogen, low-ionization, high-ionization,...
Context. GRB 211106A and 211227A are two recent gamma-ray bursts (GRBs) whose initial X-ray position enabled us to possibly associate them with bright, low-redshift galaxies ( z < 0.7). The prompt emission properties suggest that is a genuine short-duration short extended emission. Therefore, they likely be produced by compact binary merger. However, classification based solely on the can misleading. Aims. possibility of having GRBs occurring in local Universe makes ideal targets for...
ABSTRACT Much of what is known the chemical composition universe based on emission line spectra from star-forming galaxies. Emission-based inferences are, nevertheless, model-dependent and they are dominated by light luminous regions. An alternative sensitive probe metallicity galaxies through absorption lines imprinted afterglow long gamma ray bursts (GRBs) neutral material within their host galaxy. We present results a JWST/NIRSpec programme to investigate for first time relation between...
Detections of fast X-ray transients (FXTs) have been accrued over the last few decades. However, their origin has remained mysterious. There is now rapid progress thanks to timely discoveries and localisations with Einstein Probe mission. Early results indicate that FXTs may frequently, but not always, be associated gamma-ray bursts (GRBs). Here, we report on multi-wavelength counterpart FXT EP240414a, which no reported counterpart. The transient located 25.7~kpc in projection from a massive...
The extreme luminosity of gamma-ray bursts (GRBs) makes them powerful beacons, thus effective probes the distant Universe. most luminous are typically detected at moderate and high redshift, where volume for seeing such rare events is maximized star-formation activity greater than z=0. For events, not all observations feasible, as those TeV energies. Here we present a spectroscopic redshift measurement exceptional GRB,221009A, brightest GRB observed to date, with emission extending well into...
The detection and follow-up observations of high-redshift (z>6) gamma-ray bursts (GRBs) provide a unique opportunity to explore the properties distant Universe. Unfortunately, they are rather rare, with only dozen them identified so far. We present here discovery GRB second highest spectroscopic redshift measured date, GRB,240218A at z=6.782, broadband analysis its afterglow. Following by high-energy satellites, we obtained multi-epoch multi-wavelength photometric observations, from 68...
Since the first discovery of a broad-lined type Ic supernova (SN) with long-duration gamma-ray burst (GRB) in 1998, fewer than fifty supernovae (GRB-SNe) have been discovered. The intermediate-luminosity Swift GRB 161219B and its associated SN 2016jca, which occurred at redshift z=0.1475, represents only seventh GRB-SN to discovered within 1 Gpc, hence provides an excellent opportunity investigate observational physical properties these very elusive rare SN. As such, we present optical...
The number of supernovae known to be connected with long-duration gamma-ray bursts is increasing and the link between these events no longer exclusively found at low redshift ($z \lesssim 0.3$) but well established also larger distances. We present a new case such liaison $z = 0.33$ GRB\,171010A SN\,2017htp. It second closest GRB an associated supernova only three detected by Fermi-LAT. one few higher cases where spectroscopic observations were possible shows spectral similarities...
The nature of the minute-to-hour long Fast X-ray Transients (FXTs) localised by telescopes such as Chandra, Swift, and XMM-Newton remains mysterious, with numerous models suggested for events. Here, we report multi-wavelength observations EP240315a, a 1600 s transient detected Einstein Probe, showing it to have redshift z=4.859. We measure low column density neutral hydrogen, indicating that event is embedded in low-density environment, further supported direct detection leaking ionising...
We observed GRB190114C (redshift z = 0.4245), the first GRB ever detected at TeV energies, optical and near-infrared wavelengths with several ground-based telescopes Hubble Space Telescope, primary goal of studying its underlying supernova, SN2019jrj. The monitoring spanned time interval between 1.3 370 days after burst, in observer frame. find that afterglow emission can be modelled a forward shock propagating uniform medium modified by time-variable extinction along line sight. A jet break...
The chemical enrichment of dust and metals in the interstellar medium galaxies throughout cosmic time is one key driving processes galaxy evolution. Here we study evolution gas-phase metallicities, dust-to-gas (DTG) ratios, dust-to-metal (DTM) ratios 36 star-forming at 1.7 < z 6.3 probed by gamma-ray bursts (GRBs). We compiled all GRB-selected with intermediate- (ℛ = 7000) to high-resolution > 40 000) spectroscopic data, including three new sources, for which least refractory (e.g.,...
Gamma-ray bursts (GRBs) are powerful probes of early stars and galaxies, during potentially even before the era reionization. Although number GRBs identified at z>6 remains small, they provide a unique window on typical star-forming galaxies that time, thus complementary to deep field observations. We report identification optical drop-out afterglow Swift GRB 120923A in near-infrared Gemini-North imaging, derive redshift z=7.84_{-0.12}^{+0.06} from VLT/X-shooter spectroscopy. At this peak...