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23-24 septembre 2010
CESR & LATT -- Toulouse
Europe/Paris timezone
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Liste des présentations

Affichage23 contributions sur 23
on 24 sept. 2010 à 14:30
Je ferai une revue des résultats marquants concernant la phase prompte et l'émission rémanente précoce vues en optique et infrarouge proche depuis le lancement de Swift.
on 23 sept. 2010 à 11:45
GRB041219A is one of the longest and brightest Gamma-Ray Bursts (GRB) ever observed. It was discovered by the INTEGRAL satellite, and thanks to a precursor intervening about 300 s before the bulk of the burst, ground based telescopes were able to catch the rarely-observed prompt emission in the optical and in the near infrared bands. After a detailed analysis of its prompt gamma-ray emission, as ... Plus
on 23 sept. 2010 à 17:10
on 24 sept. 2010 à 09:30
on 23 sept. 2010 à 14:30
on 23 sept. 2010 à 11:00
Cette contribution discutera la production de rayons cosmiques de tres haute energie et de neutrinos de haute energie par les sursauts gamma, en faisant le lien avec les derniers resultats de l'Observatoire Pierre Auger en particulier.
on 24 sept. 2010 à 13:30
I will review results obtained recently from intermediate and high spectral resolution observations of GRB afterglows. These observations make it possible to study the interaction of the GRB emission with the surrounding gas but also the physical state of the ISM of high-z galaxies in addition to the intervening absorbers detected along the line of sight to the GRB afterglow.
on 24 sept. 2010 à 09:00
Recent detections of GeV photons in a few GRBs by Fermi-LAT have led to strong constraints on the bulk Lorentz factor in GRB outflows. To avoid a large gamma-gamma optical depth, minimum values of the Lorentz factor are estimated to be as high as 800-1200 in some bursts. Here we present a detailed calculation of gamma-gamma optical depth taking into account both the geometry and the dynamics of th ... Plus
on 23 sept. 2010 à 15:20
on 24 sept. 2010 à 15:50
Je presenterai les observations des sursauts gamma avec le Gamma-ray Burst Monitor (GBM) et le Large Area Telescope (LAT), les deux instruments a bord du Fermi Gamma-Ray Space Telescope en activite depuis 2 ans. Je passerai en revu les resultats principaux de la collaboration Fermi comme la presence de composantes additionnelles a la fonction de Band standard dans les GRBs courts et longs, la pres ... Plus
on 23 sept. 2010 à 11:15
Les détecteurs interférométriques d'ondes gravitationnelles de première génération ont atteint leur sensibilité nominale, permettant une recherche en coïncidence de supernovae, coalescences de binaires compactes et soft gamma repeaters; avec les détecteurs de sursauts gamma. L'observation simultanée du signal gravitationnel et gamma permettrait non seulement de confirmer une détection, ... Plus
on 24 sept. 2010 à 14:00
The standard analysis of data from the Large Area Telescope (LAT) is based on the full reconstruction and classification of events. The resulting spectra are yet restricted to energies greater than 100 MeV. Using a loosened event selection allows to recover the photon statistics between 30 MeV and 100 MeV, and increases our sensitivity to Gamma-Ray Bursts and other transient sources. This talk wi ... Plus
on 23 sept. 2010 à 15:00
Using a time-dependent numerical model where the prompt gamma-ray burst emission is calculated in the framework of the internal shock model on a broad energy range (from soft X-ray to GeV energies), we compute gamma ray burst lightcurves and time-evolving spectra. We show how the spectral evolution in this model is determined by the evolution of the physical conditions in the shocked regions and b ... Plus
on 23 sept. 2010 à 16:30