Sept 22 (Reuters) - EuroTeleSites AG shares made its Vienna stock market floatation opening at 4.31 euros on Friday, as Austria's leading telecommunications firm A1 Telekom Austria spun off its radio towers business to concentrate on its core business.

Books closed on Thursday for EuroTeleSites AG with a final price of 4.95 euros ($5.27) per share.

A1 Telekom Austria spun off the business to focus on its core business, including plans to expand optical fibre. In the process, A1 Telekom Austria is getting rid of one billion euros of debt, which is transferred to EuroTeleSites AG.

EuroTeleSites AG operates in six countries in Central and Eastern Europe. Last year it achieved a turnover of 232 million euros ($246.82 million) and earnings before interests, taxes, depreciation and amortization (EBITDA) of 127 million euros.

A1 Telekom Austria shareholders were offered one EuroTeleSites AG share for every four held in A1 Telekom Austria.

EuroTeleSites AG, which became the latest member of the ATX Prime index, was down 9.09% at 0751 GMT, while A1 Telekom Austria's stock was up 1.71%. ($1 = 0.9399 euros) ($1 = 0.9393 euros) (Reporting by Tristan Veyet in Gdansk Editing by Riham Alkousaa and Rachel More)