Update: Sky watchers ElPasoAllSky.com received sightings of a meteor/fireball for thsi time period (either way, there was definitely a UFO flying over Central and North Texas).
Someone has reported an Austin UFO sighting to the message board GodLikeProductions.com. The May 22nd/23rd sighting was of a meteor-like object, green in color and with an explosive quality. From the forum:
Big one, headed approximately east to west, lots of green (copper) and an explosion. Did anyone else see it?
Others chimed in and discussed similar sightings from the past. A resident of Wimberly, TX seems to have seen the UFO, too:
I saw it in Wimberley TX
Huge green/blue with large visible smoke trail, then faded out, with no noise.
One person from nearby Round Rock heard a sonic boom during the same time period:
I'm in Round Rock and heard the sonic boom. But since I was naked at the time, I could not run outside and look.
What's interesting is another meteor-like object - a blue, flashing light with a red tail - was seen in nearby Georgetown the same night.