From: Tony Spadafora (ALSpadafora@lbl.gov)
Date: Thu May 30 2002 - 20:27:21 PDT
Saul and I had further comments on the CFHT candidate(s) proposed for
WIYN which we hope can be clarified Friday morning by Julien et al.
>
> #1 C02-029 comix 14:01:52.4 +04:54:27.0 23.11
(on Rob's list) - could this be an AGN? It is very close to the core,
showed a 7% rise after a year, then a 7% rise after another month
> #2 C02-034 InTheMix 14:00:30.8 +05:13:55.6 23.45 0.242 ?
This has a VLT spectrum, but Chris and Andy's didn't see SN features.
This could be because it is mostly host galaxy. Could Lifan try fitting
this, assuming 5/6 host and see if there is any SN signal? There is
also a question of whether we will ultimately have enough lightcurve
points on this one.
> #3 C02-033 Philantropix 14:01:43.8 +05:14:52.1 24.80
> #4 C02-015 Alambix 14:01:29.8 +05:14:20.8 24.40 ** THIS ONE IS NO LONGER ON CFHT SN web page?? **
Rob was concerned about how much time we could afford for these faint
ones, but could we get a useful data point with errors comparable to the
rolling search points - which are also short exposures? (But then, WIYN
is only 3.5m and the moon is getting bright.) If the lightcurves are
good, we will get good final refs at VLT - see Chris's e-mail.
-Tony
"Robert A. Knop Jr." wrote:
>
> WIYN MAY 31 VERSION 2.0
>
> Here's the list of things to observe at WIYN. Candidates are listed in
> the order I think they ought to be done, but feel free to mix-n-match.
>
> What's new: added C02-029/comix (CFHT candidate) in place of T02-047
> (for which we have no spectrum). Note that I do not believe that
> C02-029 has a spectrum either! It is estimated at magnitude 23.11,
> although I don't know in what band; I'm assuming I-band, which is the
> pessimistic assumption. (R-I>0 for most SNe at the redshfits we're
> talking about.) Julian asked for both R and I, which we don't have time
> for; guessing that they've already got both R and I at an earlier epoch
> from CFHT, what this will really give us is a stretch, and usually R is
> the better band to do that in *if* they have enough earlier R followup
> for that to be what is best.
>
> Seb, Julian, Pierre, please clarify if this is not the case.
>
> Priority key:
>
> A -- we have a spectrum and are following; highest priority to get
> a measurement for stretch purposes.
> B -- we have a spectrum, data for stretch less necessary.
> C -- no spectrum, but has been followed photometrically
> D -- ignore this candidate; why did Rob list it?
>
> d -- ltcv going down as of WIYN May 17
> d! -- ltcv well after max as of WIYN May 17
> m -- ltcv near or just after max as of WIYN May 17
> ??? -- ltcv doesn't make sense; possible errors in fastltcv program?
> or possible errors in TNG data? (Rob: check seeings, xforms)
>
> (Lightcurve information about T02-029 and S02-058 will hopefully come
> in later.)
>
> Mag is a weak-ass magnitude estimate from the May 17 data; typically
> they will be down <~1 mag now. (These magnitudes are hopefully more
> "real" than the discovery magnitude estimates, as they do attempt to put
> in an aperture correction.)
>
> As we're getting later in the lightcurve, "on-color" observations are of
> primary importance to maximize our ability to measure a stretch.
>
> Sunset: 19:31 MST
> Twilight: 21:05 MST
> Twilight: 3:43 MST (6:40 of night; moonrise 0:16 MST)
> Sunrise: 5:17 MST
>
> (Fields get to airmasses of >=2 by morning; press on. I've put the
> brightest candidate at the end and bumped its exposure time.)
>
> Candidate z RA(2000) Dec(2000) Time R(s) Time I(s) Prio Mag
> ==============================================================================
> S02-064 .56 13:25:46.6 +27:34:20.9 4x900 B,d! ~24? (I)
>
> S02-058 13:23:37.3 +27:45:05.1 --- --- D (max ~23) (I)
>
> T02-030 .51 15:43:24.4 +07:53:57.8 3x600 4x600 A,??? 21.9? (R)
>
> T02-028 .44 15:36:25.5 +09:28:18.2 4x900 A,d 23.0 (R)
>
> T02-037 .49 15:46:57.0 +08:12:36.6 3x600 3x900 A,m 22.0 (R)
>
> C02-029 14:01:52.4 +04:54:27.0 4x600 C,? 23.1 (?)
>
> T02-047 15:36:29.9 +09:38:42.9 ---- C,m 21.8 (R)
>
> T02-029 .22 15:37:07.5 +09:36:18.7 3x600 3x600 B,m/d 20.8 (R)
>
> -Rob
>
> --
> --Prof. Robert Knop
> Department of Physics & Astronomy, Vanderbilt University
> robert.a.knop@vanderbilt.edu
-- Tony Spadafora ALSpadafora@lbl.gov Physics Division Tel: (510) 495-2316 Lawrence Berkeley National Lab FAX: (510) 486-6738 1 Cyclotron Rd., MS 50-232 Berkeley, CA 94720, USA
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