{"id":4653,"date":"2017-09-08T15:59:21","date_gmt":"2017-09-08T13:59:21","guid":{"rendered":"https:\/\/www.oa-cagliari.inaf.it\/?post_type=seminari&p=4653"},"modified":"2025-09-22T23:22:26","modified_gmt":"2025-09-22T21:22:26","slug":"gamma-ray-bursts-and-their-radio-afterglows","status":"publish","type":"seminari","link":"https:\/\/www.oa-cagliari.inaf.it\/en\/seminars\/gamma-ray-bursts-and-their-radio-afterglows\/","title":{"rendered":"Gamma-Ray Bursts and their Radio Afterglows"},"content":{"rendered":"

\"\"<\/p>\n

Gamma-Ray Bursts (GRBs) are the most energetic events on stellar scale in the Universe and for a few seconds they outshine the whole gamma-ray sky. Their progenitors –either core collapsing massive stars or binary neutron star mergers, depending on whether the GRB lasts more or less than ~2 s, respectively– launch relativistic jets with mean gamma-ray released energies around 10 51 erg and jet opening angles ranging 5-20\u00b0. GRBs are also characterised by a long-lasting emission –days through months– at lower frequencies known as “afterglow”, originating from the interaction between the ejecta and the circumburst medium. GRB afterglows encode a wealth of information that links to (i) the radiation mechanism(s) responsible for the prompt gamma-rays, in particular the possible presence of large-scale magnetic fields entrained in the ejecta, which is still of the main open issues in the field; (ii) relativistic shock microphysics; (iii) energetics; (iv) jet geometry. All these issues can be addressed effectively and uniquely through observations at lower frequencies – in particular the radio band. In this talk I will discuss how Sardinia Radio Telescope can effectively contribute to the field.<\/p>\n","protected":false},"template":"","class_list":["post-4653","seminari","type-seminari","status-publish","hentry","categorie_seminari-colloquium"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/seminari\/4653","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/seminari"}],"about":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/types\/seminari"}],"wp:attachment":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/media?parent=4653"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}