In reply to squicky: most of the astro shots ranged from 15-30 sec exposures (moon shots less due to brightness)
I set a delay on an intervalometer (my gh3 has one inbuilt, but u can pick up cheap ones on amazon etc for £20 or canons can use the magic lantern firmware hack)
I usually double the exposure for the delay e.g. 20 sec exposure and interval is 40 sec (that way u take a shot, wait 20 secs take another automatically) u need the delay though to capture movement of the stars (but ure out all night for hrs freezing while it takes 240 shots to give 10 secs of footage at 24fps....nearly 3hrs per timelapse -
if you've got stuff from rolling burst mode as you've described, then sure stick it in a video editor and render it out, all you'll have is a much faster movement as no delay btw shots.....if that makes sense? it will still look cool! just do some noise reduction and colour correcting if you can
i stitch them together with after effects, but most videdo editor software will accept an image sequence so you can usually find a free/cheap way of stitching into a video