Keck ESI Data files:

Date: 16 April 2002 (UT)
Exposure time: 600s
Data reduced by: Isobel (preliminary), Lifan & Gregory Sainton (final)
Weather note: seeing 1.3
Slit: 1.0
z (gal):
z (SN): 0.27 +/- 0.02 from final reduction.
Preliminary SN: [asc] [fits] [ps]
Prelim line cleaned SN: [asc] [fits]
Andy's Comparison (Cleaned, 20A binned, prelim): SN 1990N, -14d, z=0.30 [ps]
Output file from Andy's program (prelim): [txt]
Final SN: [asc] [fits] [rebinned 10A fits]
Final line cleaned SN: [asc] [fits]
Andy's Comparison (Cleaned, 20A binned, final): SN 1994D, -4d, z=0.27 [ps]
Output file from Andy's program (final): [txt]


Isobel (preliminary):z=0.28 Type I (from SN features). No SiII dip or galaxy lines.

Andy (preliminary):Probably a Ia judging from blue features. There is a hint of Si 4000, but nothing in red matches. Where is Si 6150? Is there something wrong with the reduction?

Note that although mathematically the best match was at z=0.30 for SN 1990N at -14 days, my program was thrown off by the non-matching data in the red. It is clear from the rest frame Si 4000 line that this SN is later than -14 days. Most other fits get the redshift as z=0.28, so I think that is a better redshift than z=0.30.

Gregory Sainton(final):I agree with you, it's really weird, where is Si @ 6100A ? Could it be a type Ic or anything else. Morover, the magnitude given by the light curve made with the CFHT follow up show that this object is 1.5 magnitude weaker than C02-000. Is it possible to conclude that it's a type Ia, finally, knowing that it's one of the fundamental feature to identify a Type Ia. Really, I don't know.

Andy (final): Even in the new reduction, something is still funny with the data -- you still can't see the Si 6150 line. And now the Si 4000 A line is not as obvious. I estimate z=0.27 for the redshift if it is a Ia. Given Gregory's comments above about the magnitude, and after looking at the lightcurve, I have lost all confidence that this is a Ia. So I have no idea what the redshift is as well.

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