Sabine's Gull in Tucson!

Monday evening a Sabine's Gull was found at some recharge basins in Tucson, AZ.  So yesterday after work I zipped over there to see it.  Sabine's Gulls are rare and irregular fall transients to Southeast Arizona.  Luckily it was still around.  The gull would occasionally fly into view and finally landed on the water where I could get a better look.  Another lifer!  It looks like a first summer bird, but correct me if I'm wrong.  As for the pronunciation, I once read somewhere that it's "suh-bean," but just found a source that says it's "say-bin."  Anyone?  Anyone?  Bueller?  I guess we should ask Sir Edward Sabine, for whom the bird is named.