Subject: SOHO/LASCO HALO CME 110621 UCMEO 93001 10621 1600/ 10621 60316 90706 0901/ 089// 113// 40645 10621 60154 80421 40816 11236 1212/ 99999 PLAIN SOHO/LASCO observed a symmetric FULL HALO CME on June 21, 2011. Event is first seen in C2 at 03:16 UT as an impulsive loop over the East at PA 90 degrees which immediately surrounds the occulting disk for a total coverage of 360 degrees wide. An inner loop system with core propagates over the N and NNE and is associated. The event continues into the C3 field beginning 03:42 to 07:06 UT to 14.5 Rsun, at which time SOHO lost contact and entered a temporary DSN data gap. This data is recoverable. Time/height measurements were marked at 6 points in C2 with speeds of 710.2 Km/sec at position angle 108 degrees. The event is marked to 14 points in C3 where it slightly decelerates. Speeds average through both fields to 644.6 Km/sec at PA 104 degrees. Acceleration of -11.66 m/sec^s. SDO/AIA 193 shows a CME beginning 01:54-04:21 UT with a flare of AR 11236 located near disk center at [N16 W08] SDO/AIA 304 shows elevating filament material from 2 channels north/north west of AR 11236 at 21:57 UT which erupts by 01:06-04:33 UT. Part of this material is seen in Lasco over the North hemisphere along with the impulsive CME with the flare. STEREO EUVI A beacon data sees AR11236 just on NE limb with the loop CME at 02:05 UT. COR2 A beginning 03:09 UT a bright emission feature on the NE which is most probably material associated with the filament release along with expanding material over the east hemisphere with the flare of AR 11236. NOAA reports a C7.7 long duration xray flare of AR 11236 01:22-04:27 UT This is most probably the cause of the FULL HALO event seen in LASCO. The observation of this event is considered 'GOOD'. This CME is determined a FRONTSIDED event. Images and movies and time/height information for this event is available on the web at: http://umbra.nascom.nasa.gov/lasco/observations/halo/2011/110621/ Best regards, Kevin Schenk Solar Heliospheric Observatory EIT and LASCO Operations NASA-Goddard Space Flight Center, USA BT