Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confr..34c&link_type=abstract
"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 34-34"
Astronomy and Astrophysics
Astrophysics
Scientific paper
Since their discovery in 1967, GRBs have been puzzling to astrophysicists. With the advent of a new generation of X--ray satellites in the late 90's, it was possible to carry out deep multi-wavelength observations of the counterparts associated with the long GRBs class just within a few hours of occurrence, thanks to the observation of the fading X-ray emission that follows the more energetic gamma-ray photons once the GRB event has ended. The fact that this emission (the afterglow) extends at longer wavelengths, led to the discovery optical/IR/radio counterparts in the last decade, greatly improving our understanding of these sources. The launch of the Swift satellite in 2004 allows to detect about 100 events/yr, with a mean redshift of 2.7 for the long duration GRB class. The central engines that power these extraordinary events are thought to be the collapse of massive stars whereas the merging of compact objects seems to support the few detections of short GRBs detected so far. Searches for emission at VHE and UHE have been unsuccessful till now.
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