That happened to me also, and it was my very first flash on the Vibrant. It soft-bricked, but I just kept at it... got back into download mode... and tried again. It worked. As far as I can gather, as long as you can still get to download mode, you are golden, even if it takes a try or two. It seems that Odin is sometimes temperamental. It only takes a couple of minutes to flash via Odin, but when you are sitting there waiting for the PASS notification, it does seem like an eternity the first time you do it.
I got a FAIL the first two times on the very first attempt. It's a bit unnerving when you aren't sure it'll come back.
PHONE: Samsung Galaxy Note 3 (SM-N900)
ROM: [KitKat][4.4.2] Stock N900UBUDND1 APR 17, 2014 CF-Auto-Root
RECOVERY: CWM 188.8.131.52
WARRANTY BIT: 1
TABLET: Kindle Fire HD 8.9 Stock
“He who answers a matter before he hears it, It is folly and shame to him.” Proverbs 18:13