** Austal ASB.AX rises as much as 3.2% to record high of A$8.29; marks third straight session of gains
** Stock gains 5% so far this week; set to record second consecutive week of gains
** Shipbuilder and defense contractor said on Thursday U.S. Coast Guard exercised options worth $314 mln with Austal USA for offshore patrol cutter programme
** Original contract, entailing $3.3 bln in potential value, awarded to co's U.S. unit in 2022
** YTD, ASB surges ~164%
(Reporting by Shruti Agarwal in Bengaluru)
((Shruti.Agarwal@thomsonreuters.com))