Merge branch 'main' into xmm-contrib

.gitignore

@@ -13,4 +13,4 @@
 *.pdf
 *.toc
 ivoatexmeta.tex
-.project
+.project

VOHE-Note.tex

@@ -256,11 +256,29 @@ \subsubsection{XMM-Newton}
 
 \subsubsection{SVOM}
 
-The SVOM mission (Space-based multi-band astronomical Variable Objects Monitor) is a Franco-Chinese mission dedicated
-to the study of the most distant explosions of stars, the gamma-ray bursts. It is to be launched in 2024.
-
-\todo[inline]{To be completed}
-
+SVOM (Space-based multi-band astronomical Variable Objects Monitor) \footnote{https://www.svom.eu/en/home/} 
+is a Sino-French mission dedicated
+to the study of the transient high-energy sky, and in particular to the detection, localization and 
+study of Gamma Ray Bursts (GRBs).
+Gamma-ray bursts are sudden, intense flashes of X-ray and gamma-ray light.
+They are associated with the cataclysmic formation of black holes, either by the merger of two compact stars 
+(neutron star or black hole) or by the sudden explosion of a massive star, twenty to one hundred times the mass of our Sun.
+The birth of a black hole is accompanied by the ejection of jets of matter that reach speeds close to the speed of light.
+These jets of matter then decelerate in the circumstellar medium, sweeping away everything in their path.
+Gamma-ray bursts can be observed at the very edge of the universe, acting as lighthouses that illuminate 
+the dark ages of its creation. Although they have been studied extensively over the past fifteen years,
+gamma-ray bursts are still poorly understood phenomena. To better understand them, China and France have decided
+to join forces with the SVOM satellite, which is specifically dedicated to the study of gamma-ray bursts.
+
+The special feature of the SVOM mission is that it combines ground-based and space-based observations,
+providing a spectral bandwidth from the visible to the high-energy range. By guaranteeing multi-wavelength
+observations of about one hundred bursts of all types per year, the SVOM mission will make a unique contribution
+to two of the most fruitful areas of research in recent decades: the use of bursts in cosmology and the understanding
+of the phenomenon. Looking further ahead, the SVOM mission will work in close synergy with a new generation of
+instruments dedicated to the search for neutrinos and gravitational waves of cosmic origin, in order to confirm
+the astrophysical origin of the signals detected by these future instruments.
+
+SVOM has been successfully launched on June 22 2024 from  Xichang lauchpad.
 
 
 \subsection{KM3Net and neutrino detection}