GB3 - Cosmology and multi-messenger astrophysics with Gamma-Ray Bursts |
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Speaker |
D'Avanzo, Paolo |
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| Talk Title |
The evolution of the afterglow of GW 170817 / GRB 170817A |
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Abstract |
The spectacular detection of the first electromagnetic counterpart of a gravitational wave event detected by the LIGO/Virgo interferometers and originated by the coalescence of a double neutron star system (GW 170817) marked the dawn of a new era for astronomy. The (weak) short GRB 170817A associated to the GW event provided the long-sought evidence that at least a fraction of short GRBs are originated by NS-NS merging and suggested the intriguing possibility that relativistic jets can be launched in the process of a NS-NS merger. A world-wide extensive observing campaign was launched across the electromagnetic spectrum leading to the rapid (delta_t < 11 h) discovery of a bright UV/optical/NIR transient in the galaxy NGC 4993 (at ~40 Mpc). The wealth of data collected provided the first compelling observational evidence for the existence of “kilonovae”, i.e. the emission due to radioactive decay of heavy nuclei produced through rapid neutron capture. A faint X-ray and radio counterpart was detected only at relatively late-times, suggesting for the possibility of off-axis GRB afterglow emission. In this talk I will present a review of the results of the broad-band follow-up observations of the GRB afterglow associated to this (so far) unique event and the implications for current GRB models. |
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