Chris (preliminary): A beautiful type Ia at z~0.58.
Isobel (preliminary): I agree with SN identification. Possibly galaxy OII and Ca H&K at z=0.579. See junk15_snz.ps
Chris (final): SN Ia z=0.58
Andy (final): We can say with complete metaphysical certitude that this is a Ia. It looks like SN 1981b at max at z=0.58, though the Ca absorption at 6000 A at 3700 A rest is somewhat bluer and broader in Junk 15 (we really have to give this a real name). See S01-054.81b.max.ps, which has been S-G smoothed.