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#grb

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IRAP

[#MultiMessenger Astrophysics] The very first colloquium of the #astrophysics Center for Multimessenger Studies in Europe (#ACME) is being held this week in Toulouse. It brings together numerous specialists in #GRB, #kilonovae, compact #binaries and more. These are the main transient and periodic sources of gravitational waves that travel through our #Universe, and which numerous experimental devices are attempting to intercept - from both ground and space.

More info: acme-grav-waves.sciencesconf.o

First Center for Multimessenger Studies in Europe workshop
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Raumfahrer.Net Neuigkeiten

AstroGeo Podcast: Der hellste Gammablitz aller Zeiten
Gammablitze sind die energiereichsten Explosionen, die das All zu bieten hat und toppen sogar Supernova-Explosionen: Sollte ein solcher Gammablitz die Erde aus nächster Nähe treffen, könnte er ein Massenaussterben auslösen. Wie wahrscheinlich ist das? (Bild-Quelle: NASA/Swift/A. Beardmore (University of Leicester)). #Astrogeo #GRB
raumfahrer.net/astrogeo-podcas

Diesen Anblick bekommt ihr nur alle 10.000 Jahre zu sehen: Am 9. Oktober 2022 traf der bislang hellste gemessene Gammablitz auf die Erdatmosphäre, Spitzname: BOAT, eigentliche Bezeichnung: GRB 221009A. Quelle: NASA/Swift/A. Beardmore (University of Leicester) Vor einem schwarzen Hintergrund ist im Zentrum ein orange-gelblicher Kreis zu sehen, umgeben von mehreren konzentrischen Ringen, die ebenfalls orange-gelblich eingefärbt sind und deren Dichte nach außen hin abnimmt.
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Daniel Fischer

The ultra-long #GRB 220627A at z=3.08: arxiv.org/abs/2307.10339 -> "GRB 220627A is a rare burst with two distinct gamma-ray emission episodes separated by almost 1000 s that triggered the Fermi Gamma-ray Burst Monitor twice. [...] The discovery of the optical afterglow with MeerLICHT led to MUSE observations which secured the burst redshift to z=3.08, making this the most distant ultra-long gamma-ray burst (GRB) detected to date."

arXiv.orgThe ultra-long GRB 220627A at z=3.08GRB 220627A is a rare burst with two distinct gamma-ray emission episodes separated by almost 1000 s that triggered the Fermi Gamma-ray Burst Monitor twice. High-energy GeV emission was detected by the Fermi Large Area Telescope coincident with the first emission episode but not the second. The discovery of the optical afterglow with MeerLICHT led to MUSE observations which secured the burst redshift to z=3.08, making this the most distant ultra-long gamma-ray burst (GRB) detected to date. The progenitors of some ultra-long GRBs have been suggested in the literature to be different to those of normal long GRBs. Our aim is to determine whether the afterglow and host properties of GRB 220627A agree with this interpretation. We performed empirical and theoretical modelling of the afterglow data within the external forward shock framework, and determined the metallicity of the GRB environment through modelling the absorption lines in the MUSE spectrum. Our optical data show evidence for a jet break in the light curve at ~1.2 days, while our theoretical modelling shows a preference for a homogeneous circumburst medium. Our forward shock parameters are typical for the wider GRB population, and we find that the environment of the burst is characterised by a sub-solar metallicity. Our observations and modelling of GRB 220627A do not suggest that a different progenitor compared to the progenitor of normal long GRBs is required. We find that more observations of ultra-long GRBs are needed to determine if they form a separate population with distinct prompt and afterglow features, and possibly distinct progenitors.
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Daniel Fischer

"I report that #GRB 980425/SN 1998bw falls within the region of interest (ROI) with the highest significance in an all-sky blind search for magnetically-induced effects in the arrival directions of #UHECRs conducted by the Pierre Auger Collaboration with events detected up to to 2018 August 31," says arxiv.org/abs/2305.01500: "There is also report in the literature of delayed TeV emission in archival #Fermi-LAT observations from the direction of GRB 980425/SN 1998bw."

arXiv.orgSpatial coincidence between ultra-high energy cosmic rays and TeV gamma rays in the direction of GRB 980425/SN 1998bwGamma-ray bursts (GRBs) have long been suspected as possible ultra-high energy cosmic ray (UHECR) accelerators. In this brief note, I report that GRB 980425/SN 1998bw falls within the region of interest (ROI) with the highest significance in an all-sky blind search for magnetically-induced effects in the arrival directions of UHECRs conducted by the Pierre Auger Collaboration with events detected up to to 2018 August 31. There is also report in the literature of delayed TeV emission in archival Fermi-LAT observations from the direction of GRB 980425/SN 1998bw. The combined probability that two distinct cosmic ray acceleration signatures in two different multimessenger experiments may appear at the same spatial location by chance is estimated to be between $1.62 \times 10^{-3}$ and 0.0157.
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RTN

"Forschende des .. AIP, der .. ESO und des Kavli-Instituts und des Instituts für Physik des MIT haben entdeckt, dass Magnetfelder in Mehrfachsternsystemen mit mindestens einem schweren, heißen blauen Stern viel häufiger vorkommen als bisher von Fachleuten angenommen. Eine Pressemitteilung des AIP."

raumfahrer.net/aip-magnetische

#AIP #Astronomie #Doppelsternsystem #ESO #ESPaDOnS #GRB #HARPS #Magnetfeld #Magnetosphäre #Mehrfachsystem #OTypStern #Spektropolarimetrie #Supernovae

28.3.2023

www.raumfahrer.netAIP: Magnetische schwergewichtige Sterne brauchen Gesellschaft – Raumfahrer.net
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