Well if it took your picture you will receive something in the mail withing a couple weeks.
If the light was red when you crossed into the intersection it only takes a fraction of a second and you'll get your picture taken. My wife just got a ticket for this and it shows you how long after the light turned red you crossed the line (hers was 0.23 seconds) and will even have a video you can see that they will send you a link to.
In california its a 400+ dollar ticket, so hopefully you got into the intersection before the light was red.