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Mr Nicolas Dagoneau (CEA Paris-Saclay), Stéphane Schanne (CEA Saclay), Volker Beckmann (MESR / DGRI / SSRI / A7)30/05/2023, 18:00
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Renaud Belmont (IRAP)31/05/2023, 08:45
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Andreas Zech (LUTH - Observatoire de Paris)31/05/2023, 10:45
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Volker Beckmann (MESR / DGRI / SSRI / A7)31/05/2023, 16:00
As a researcher, you are not only producing scientific articles. Most likely, you are creating valuable data sets, that could be re-used and used in a different context if available and in the right format. You might produce software that might benefit other researchers.
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Open and FAIR Science is the concept of sharing research results and ensuring that data are indeed FAIR, i.e. findable,... -
Etienne Russeil (Université Clermont Auvergne, LPC, Clermont Ferrand, France)31/05/2023, 17:45
Feature extraction is one of the crucial stages in trying to apply machine learning to tasks on real astronomical data. In particular, when dealing with transients where light-curves are sparsely sampled, with varying numbers of points and in the presence of uncertainties. One of the standard methods to extract features from a light curve is to find the best fit parameter values to a...
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Priscila J. Pessi31/05/2023, 17:55
Superluminous supernovae II (SLSNe II) are a sub-class of Type II SNe defined by light-curve peaks brighter than ~ -20 mag in optical bands. This definition is somewhat arbitrary. The scarcity of these events complicate the study of their origins. Systematic studies of large sample of SNe II usually do not include events with light-curve peaks brighter than ~ -18.5 mag in the V band,...
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Sabrina DeSoto (University of Denver)31/05/2023, 18:05
SN 2012au is a key intermediate object between Type Ib supernovae (SNe), superluminous SNe and the highly-energetic, hypernovae. This unusual SN had a higher mass loss rate than other hypernovae but likely arose from a progenitor star of about 80 solar masses. These two findings contradict previous theories that more massive stars could not produce such an explosion, suggesting that a...
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Ben Warwick (University of Warwick)31/05/2023, 18:15
Observations of supernovae (SNe) within a couple of days post explosion have the potential to probe the physics of their early evolution. This could provide insight into physics of several phenomenon including shock breakout, interactions with circumstellar material, and companion interactions. Unfortunately these early time observations are rare. I will present my work on automating the...
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Luca Crepaldi31/05/2023, 18:25
A few decades have passed since the identification of narrow-line Seyfert 1 (NLS1) galaxies as a subclass of active galactic nuclei (AGN). NLS1s show a Seyfert 1-like spectrum, but with emission line widths similar to those of Seyfert 2 spectra. Such features are often believed to be produced by a high accretion rate, close to the Eddington limit, coupled with a low-mass black hole (< 108M⊙)....
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Xu-Hong Ye31/05/2023, 18:35
Our knowledge of Giga-electron volt (GeV) Active galactic nuclei (AGNs) has been revolutionized by the Fermi-LAT Telescope. Fermi-LAT-detected blazars show stronger beaming effects than non-Fermi-LAT-detected blazars (Pushkarev et al. 2009; Linford et al. 2011 ;Wu et al. 2014). Based on the unifi-cation of blazars and radio galaxies (Urry & Padovani 1995), it is reasonable to consider that...
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Mr Nicolas Dagoneau (CEA Paris-Saclay), Stéphane Schanne (CEA Saclay)31/05/2023, 19:00
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Andreas Zech (LUTH - Observatoire de Paris)01/06/2023, 08:45
Please find my slides on the first time slot for this lecture (Wednesday, 31st May).
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Renaud Belmont (CEA)01/06/2023, 13:30
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Stan Barmentloo (Stockholm Username)01/06/2023, 15:00
Supernovae (SNe) play an essential role in accounting for the origin of the elements observed in our universe. To translate the information on the ejected elements contained in observed SN-spectra, careful modelling of the SNe is required. In this talk, I will discuss the nebular phase spectra resulting from modelling a set of He-star explosions (progenitors of type Ibc SNe). The set spans a...
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Patrik Milan Veres01/06/2023, 15:10
Tidal disruption events (TDEs) are transient events that occur when a star approaches the vicinity of a supermassive black hole (SMBH) and the tidal forces of the latter rip the star apart. About half of the star's material is swallowed, while the other half is accreted around the black hole, generating a luminous outburst ranging from radio to X-ray wavelengths. In addition, three candidate...
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Laurent Chevalier (CEA)01/06/2023, 16:00
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Giacomo Sommani01/06/2023, 17:45
In 2013, the IceCube collaboration announced the detection of diffuse high-energy astrophysical neutrino flux. The origin of these particles is still unknown as there is still no identification of a source at the 5-sigma level. To answer this question, IceCube releases realtime alerts triggering follow-up observations in multiple wavelengths looking for electromagnetic counterparts to...
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RileyAnne Sharpe (The University of Alabama)01/06/2023, 17:55
On September 22, 2017, the IceCube Neutrino Observatory detected a high-energy neutrino of potential astrophysical origin which was found by follow-up electromagnetic observations to spatially and temporally coincide with the flaring state of a known blazar, TXS 0506+056. Since then, several additional neutrino events have been found in spatial correlation with known highenergy sources....
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Marion Guelfand (Lpnhe)01/06/2023, 18:05
The origin of ultra-high-energy cosmic rays (UHECRs) is still unknown. They are likely produced in powerful cosmic accelerators but, because of their low flux and their deflections when they propagate across the magnetized Universe, it is difficult to collect them with large statistics and to infer their sources. When reaching the Earth, UHECRs penetrate the atmosphere and induce air-showers,...
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Hannah Dykaar (University of Toronto)01/06/2023, 18:15
A Tidal Disruption Event (TDE) occurs when a star gets close enough to a supermassive black hole, such that the tidal forces are able to rip the star apart, causing a multiwavelength transient flare. These events illuminate the complex environments of galactic centers in what may otherwise be quiescent galaxies. TDEs are typically discovered at shorter wavelengths (optical, Xray) but with new...
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Markos Polkas01/06/2023, 18:25
There have been many studies to explain the observed Tidal Disruption Events (TDE) rates, although we started identifying such events only in the last decade. Some predict that the rates are unexpectedly high and others conclude the observed TDE rates are what we would expect when combining the BH mass function and our understanding of the mechanism triggering a TDE. Our study offers as the...
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Rahul Jayaraman (Massachusetts Institute of Technology)01/06/2023, 18:35
The Transiting Exoplanet Survey Satellite (TESS) has been conducting a wide-field, space-based survey of the entire night sky to identify transiting exoplanets. Additionally, its large field of view (2304 sq. deg) and continuous, high-cadence, monthlong observations of a given region of the sky lend it well to the discovery and characterization of transients. TESS can work in conjunction with...
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Dr Pierre Cristofari (Observatoire de Paris - IJCLab)02/06/2023, 08:45
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Irina Dvorkin (Institut d'Astrophysique de Paris)02/06/2023, 13:30
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Léonard Lehoucq (Institut d'Astrophysique de Paris)02/06/2023, 15:00
Stochastic gravitational-wave backgrounds (SGWB) derive from the superposition of numerous individually unresolved gravitational-wave (GW) signals. In this talk, I will present a detailed modelization of the SGWB from compact binary mergers. I will discuss the use of population synthesis models to estimate the expected rate and properties of binary mergers for different types of compact...
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Godefroy Vannoye02/06/2023, 15:10
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Dr Pierre Cristofari (Observatoire de Paris - IJCLab)02/06/2023, 16:00
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Mr Nicolas Dagoneau (CEA Paris-Saclay)02/06/2023, 17:45
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Irina Dvorkin (Institut d'Astrophysique de Paris)03/06/2023, 08:45
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M. Branchesi03/06/2023, 10:45
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04/06/2023, 08:00
Also on Sunday there is breakfast offered at the institute. But no lunch!
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Prof. Frédéric Daigne (Institut d'Astrophysique de Paris - Sorbonne Université)05/06/2023, 09:00
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Rob Fender (University of Oxford)05/06/2023, 11:00
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Alex Andersson05/06/2023, 15:50
The study of radio transients probes an immense range of astrophysical regimes - from flare stars to FRBs - and with the advent of current interferometers we can sample wide swathes of the radio sky with unprecedented sensitivity and cadence. Firstly, I will discuss recent, serendipitous discoveries being made with the MeerKAT radio telescope and how we can make the best of new facilities...
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Prof. Frédéric Daigne (Institut d'Astrophysique de Paris - Sorbonne Université)05/06/2023, 16:00
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Davide Pelliciari05/06/2023, 17:35
Fast radio bursts (FRBs) are intense, millisecond-long radio signals of unknown extragalactic origin. The detection of the very first galactic FRB-like signal from the magnetar SGR J1935+2154 has strengthened the connection between FRBs and magnetars. Using the Northern Cross radio telescope, we conducted a targeted search for FRBs in a sample of seven nearby galaxies, with a total observation...
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Sk. Minhajur Rahaman05/06/2023, 17:45
Internal shocks are one of the prominent dissipation mechanisms for the prompt gamma-ray emission. In internal shocks, each collision between two shells forms a pair of forward and reverse shocks, which dissipate part of their kinetic energy. This dissipation is governed by the hydrodynamics. However, most studies in the literature treat this as a plastic collision of two infinitely thin...
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Taya Govreen-Segal05/06/2023, 17:55
Merging neutron stars (and most likely also black hole-neutron star mergers) emit gravitational waves (GW) and electromagnetic radiation. These mergers are followed by the launching of ultra-relativistic jets that presumably produce a short gamma-ray burst GRB that we detect across the entire EM spectrum. The geometry of these jets is of special interest. Their observing angle can...
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Beatrice Vaia05/06/2023, 18:05
X-ray rings produced by scattering on interstellar dust grains can be observed around transient bright sources in the direction of the Galactic Plane. The study of the rings emission, allows us to derive with extraordinary precision the details of the X-ray burst producing them (fluence and the spectral shape) and - at the same time - to characterize the dust properties along the line of...
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Nathan Franel (IJCLab - A2C)05/06/2023, 18:15
Despite their discovery 50 years ago, emission mecanisms and models of gamma ray bursts (GRBs) are not well constrained by spectrometry alone. Precise polarimetric measurement could bring new insights on the way these transient events are produced. COMCUBE is a project of CubeSat constellation using Compton telescopes to detect polarity of GRB prompt emission from about 100keV up to 1MeV. I...
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Emily Biermann05/06/2023, 18:25
Until now, the millimeter transient sky has been largely unobserved. CMB surveys now have sufficient resolution, sensitivity, and sky coverage to study these events. Synchrotron radiation associated with strong magnetic fields is the likely source of many millimeter flares. Studying these flares can provide insight into the mechanisms behind this radiation as well as constraints on statistical...
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Alessio Mei05/06/2023, 18:35
The origin of gamma-ray bursts (GRBs) is still mysterious. We believe that binary neutron star (BNS) mergers produce short GRBs, while long GRBs are associated to the collapse of massive stars. This GRB dichotomy, based on the duration of the prompt pulse, was recently challenged by the detection of the bright and relatively close (z = 0.076) GRB 211211A. Despite its long duration (∼ 30 s),...
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Stéphane Schanne (CEA Saclay)06/06/2023, 08:45
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Susanna Vergani (CNRS-Observatoire de Paris)06/06/2023, 10:45
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Diego Gotz (CEA Saclay)06/06/2023, 16:00
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Clara Plasse (Université Paris-cité, CEA)06/06/2023, 17:45
Gamma-Ray Bursts (GRB) are short (up to few tens of seconds) and intense flashes of gamma-rays, appearing from random directions over the entire sky. These flashes are either created by the collapse of very massive stars (more than 50 times the mass of the Sun), or the merging of two compact objects (e.g. two neutron stars). The event of the 17th August 2017, as the first joint observation of...
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Wenjin XIE (CEA-saclay Irfu)06/06/2023, 17:55
The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a Chinese-French mission dedicated to the study of the transient sky, scheduled for launch in 2024. Its core program focuses on the gamma-ray bursts (GRB) detection thanks to the ECLAIRs telescope and its onboard trigger system. This instrument under French responsibility is a large field of-view coded mask telescope....
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Antoine Foisseau (AstroParticules et Cosmologie - APC)06/06/2023, 18:05
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Miti Patel06/06/2023, 18:15
My PhD research has been on GRB 201015A, a GRB with lower energetics and a softer spectrum than the majority of the population. I extensively studied the afterglow observations of GRB 201015A. Evidence of energy injection has been found from a surprising shallowing in the x-ray light curve. I studied a small sample of GRBs with similar properties, and I expect the launch of SVOM will add...
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Riccardo Brivio06/06/2023, 18:25
In the context of modern astrophysics, transient phenomena are among the most fascinating and challenging to observe and analyse, usually arising from physically extreme conditions. Gamma-ray bursts (GRBs), the most energetic phenomena in the whole Universe, fall into this category, being produced after the collapse of a massive star or a compact binary merger. Their main emission, lasting...
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Clément Pellouin (Institut d'Astrophysique de Paris - Sorbonne Université)06/06/2023, 18:35
The binary neutron star merger gravitational-wave event GW 170817 and the multi-wavelength observations of its off-axis afterglow have allowed to probe the lateral structure of its associated relativistic jet. In addition, several gamma-ray bursts such as GRB 190114C or GRB 221009A (the brightest GRB ever observed) have recently been detected at Very High Energy (VHE, > 1 TeV) and are...
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Prof. Frédéric Daigne (Institut d'Astrophysique de Paris - Sorbonne Université)06/06/2023, 19:00
General public conference (in French)
La fusion de deux étoiles à neutrons est un phénomène rare mais particulièrement extrême, qui s’accompagne d’une intense émission d’ondes gravitationnelles (que l’on sait détecter depuis 2015) et de nombreux signaux lumineux, des ondes radio aux domaines infrarouge et visible et aux rayons X et gamma. Croiser ces différents signaux qui apportent des...
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Prof. Joern Wilms (Remeis Obs. & ECAP, FAU Erlangen-Nuernberg)07/06/2023, 08:45
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Sebastien Guillot (IRAP)07/06/2023, 10:45
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V. Grinberg07/06/2023, 16:00
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Paramvir Singh07/06/2023, 17:40
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Tristan Bouchet (CEA-AIM)07/06/2023, 17:50
Microquasars are Black Hole X-ray binaries that show bright emission at energies above 1 keV along with radio jets. These are transient objects that are typically only visible for a few months during their so-called “eruption”, and go back into quiescence for years or decades. During these eruptions, the Black Hole accretes matter from its stellar companion and the resulting accretion disk is...
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Abubakr Ibrahim07/06/2023, 18:00
Swift J1818.0-1607 is a rapidly rotating magnetar (P ~ 1.36 s) that was discovered in March 2020 during an outburst. Follow-up radio observations confirmed its nature and identified it as the sixth radio-loud magnetar known to date. Swift J1818.0-1607 is also one of the most rapidly spinning magnetars and one of the youngest neutron stars in the galaxy. In this talk, I will present the results...
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Arthur Charlet07/06/2023, 18:10
Neutron stars are typically born in core-collapse supernova explosions, and are often rapidly spinning with a large initial rotational energy E0 that can approach or even exceed the SN explosion’s kinetic energy, ESN. Their considerable surface dipole magnetic field causes them to spin down, channeling their rotational energy into an extremely relativistic MHD wind. This inflates a pulsar wind...
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Michele Ronchi07/06/2023, 18:20
Although about a billion neutron stars are expected to exist in the Milky Way, observational constraints limit us to only observing a few thousand. Pulsar population synthesis bridges this gap by simulating the entire population and comparing it to the observed sample to constrain neutronstar physics. In this talk, we explore the possibility of using simulation-based inference based on neural...
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Giulia Illiano07/06/2023, 18:30
Accreting millisecond pulsars (AMSPs) are rapidly rotating neutron stars hosted in a tight binary system with a low-mass companion. Their millisecond periods result from a Gyr-long phase in which old radio pulsars are spun up by accreting matter from a donor via a Roche lobe overflow. SAX J1808.4-3658 was the first AMSP discovered in 1998. Since then, the source has undergone ten ∼...
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Zijian Zhang (The University of Hong Kong)07/06/2023, 18:40
X-ray reverberation is a powerful technique used to measure the black hole in the thin disk system. Recent observation of tidal disruption events shows that X-ray reverberation arising from characteristic Fe Kα photons can also happen in the super-Eddington system. State-of-the-art simulations show that optical and geometrical thick wind can be launched in the super-Eddington accretion. The...
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Tetyana Pitik07/06/2023, 18:50
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Prof. Joern Wilms (Remeis Obs. & ECAP, FAU Erlangen-Nuernberg)08/06/2023, 08:45
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V. Grinberg08/06/2023, 10:45
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Damien TURPIN (CEA-Saclay)08/06/2023, 16:00
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Carlotta Miceli (Università degli studi di Palermo)08/06/2023, 17:35
We report on the results obtained by an optical spectroscopy study performed on the black hole transient MAXI J1305−704 during its 2012 outburst. We analysed two observations taken by the Magellan Clay Telescope during two consecutive nights, when the source was in a soft X-ray spectral state. Then, we extracted 12 phase-resolved spectra and performed a spectral fitting of the dominant H-alpha...
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Alessandra Ambrifi08/06/2023, 17:45
Low Mass X Ray Binaries (LMXBs) are transient systems whose outbursts are characterised by a variety of accretion and ejection phenomena, such as jets, winds of ionized material and intense X-ray emission. These objects have been extensively studied in the X-ray band, in which they are usually discovered, but during the past few decades the focus has shifted towards their optical and infrared...
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Stefano Tugliani (University of Turin)08/06/2023, 17:55
My PhD project deals with astrophysical X-ray polarimetry. The state-of-art is the Imaging X-ray Polarimetry Explorer (IXPE), launched on 9 December 2021 (collaboration NASA and ASI) to measure the linear polarization of different astrophysical sources over the photon energy range 2-8 keV. One of the goals of my project is the analysis of IXPE data provided by current observations. In...
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Marina Masson (LPSC)08/06/2023, 18:05
Gamma-Ray Bursts (GRBs) are among the most energetic phenomena in the Universe. The interaction of their blast wave with the Interstellar Medium produces an afterglow that can be observed from a larger angle, in a wide range of the electromagnetic spectrum and during more time than the prompt emission. Viewed off-axis, this emission has a negligible gamma-ray flux and is hence called ”GRB...
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Tal Wasserman08/06/2023, 18:15
One aspect of Supernova (SN) explosions that has received attention is the shock breakout, which occurs when the radiation from the shock caused by the explosion starts to escape. This can happen at the surface of the star, generating a rapid flash, or at much larger radii, if the star has a dense circum-stellar material (CSM) surrounding it, potentially extending the breakout timescale to...
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Iuliia Grotova08/06/2023, 18:25
The SRG/eROSITA all-sky survey offers a unique insight into the transient X-ray sky. Using data obtained during the first two all-sky surveys, we have compiled the largest systematically-selected sample of X-ray transients associated with the nuclei of galaxies without prior signs of AGN activity to date. Benefiting from the unprecedented sensitivity of eROSITA, we have characterised the...
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08/06/2023, 19:00
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Damien TURPIN (CEA-Saclay)09/06/2023, 08:45
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Ben Shenhar09/06/2023, 09:55
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Ruiyi Tang09/06/2023, 10:05
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Stéphane Schanne (CEA Saclay)
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