Ganymede gradually disappeared into Jupiter's shadow from 0147 to 0154 UT. You can see a video of the eclipse here:

https://dl.dropboxusercontent.com/u/58468743/2016-04-18-GanymedeEclipseULRGformat.avi

That should play in Windows Media Player. A compressed version (lossy, but much smaller file) is here:

https://dl.dropboxusercontent.com/u/58468743/2016-04-18-0147_9-L_pipp_0001_g4_ap1_pipp2.avi