The Swift satellite observed a new outburst from SAX J1818.6-1703 a Supergiant Fast X-ray Transient on the 6th May, 2009, at 14:02:11 UT. SAX J1818.6-1703 was first discovered in 1998 by the BeppoSAX satellite.
Recent analyses of the history of SAX J1818.6-1703 have discovered a 30-day period in this supergiant binary system strongly indicative of a binary orbital period.