From: clidman (clidman@eso.org)
Date: Sun Apr 21 2002 - 12:59:12 PDT
Dear Ariel,
For J=23.3, we will need five hours of shutter time (6.5 hours with overheads) to reach
a S/N of 15 in good seeing (0.5").
Cheers, Chris.
Ariel Goobar wrote:
> Hi Chris,
> I would expect it to be around J=23.3.
> Cheers,
> Ariel
>
> On Sun, 21 Apr 2002, clidman wrote:
>
> > Hi Ariel,
> > My first guess is that it will take longer as the ZPs are now lower than when Beethoven
> > was observed. Can you give me a rough idea of what you expect for the peak J-band
> > magnitude of S02-032. I can then let you know how long it should take to get a S/N of 15
> > in 0.5" seeing.
> >
> > Cheers, Chris.
> >
> >
> > Ariel Goobar wrote:
> >
> > > Hi Chris,
> > >
> > > if S02-032 turns out to be somewhat overluminous, such as the
> > > discovery I-band magnitude would seem to indicate it would
> > > seem natural to expect it to be as overluminous in J (V in restframe).
> > > It would then put the J peak brightness to somewhere between the
> > > two observations of Beeethoven 24 and 47 days past max.
> > > If I look at the exposure lengths we had then (1 hour each) and
> > > S/N~5-7.5, my conclusion is that 3-4 hours in excellent conditions might
> > > be all we need. Do you agree?
> > > What do you think are the chances of making a quick analysis of the
> > > data after a few hours of exposure?
> > >
> > > Cheers,
> > > Ariel
> > >
> > > On Sun, 21 Apr 2002, clidman wrote:
> > >
> > > > Dear Ariel,
> > > > I will ask the VLT to target S02-032 tonight. Conditions
> > > > on Paranal have deteriorated over the last 24 hours. There is
> > > > a strong wind from the North which, if it continues, will prevent
> > > > them from observing S02-032.
> > > >
> > > > Cheers, Chris.
> > > >
> > > > Ariel Goobar wrote:
> > > >
> > > > > Hi,
> > > > > I tend to agree with both Chris and Isobel about the high risk
> > > > > of trying to do both targets at NIRI under the current conditions. It
> > > > > seems to me that it would be sensible to go for the brighter z=1.08
> > > > > target, S02-032, with ISAAC tonight and tomorrow.
> > > > >
> > > > > The 2 x z=0.5 guys for which we also got ISAAC time should be left
> > > > > for the May run, where we should be able to make better optical
> > > > > lightcurves.
> > > > >
> > > > > Ariel
> > > > >
> > > > > On Sun, 21 Apr 2002, clidman wrote:
> > > > >
> > > > > > Hi Isobel,
> > > > > > The ISAAC schedule has been fluid these past two weeks because of technical problems
> > > > > > with the instrument. The 21st an 22nd are service nights. The 23rd to 25th are reserved
> > > > > > for VLTI commissioning and the 26th is a technical night which might be switched to service.
> > > > > > The 27th to 30th are full service nights and the 1st to 3rd are service for the 1st half of the night.
> > > > > >
> > > > > > Cheers, Chris.
> > > > > >
> > > > > >
> > > > > > Isobel Hook wrote:
> > > > > >
> > > > > > > Hi all,
> > > > > > >
> > > > > > > OK well it sounds as though it may not be worth going for a host for
> > > > > > > Satie this NIRI run. If it turns out we dont get to use all our NIRI time
> > > > > > > this run then doing Satie in June is still a possibility (There is no NIRI
> > > > > > > time available in May).
> > > > > > >
> > > > > > > I quite agree with Chris that these observations can take a long time and
> > > > > > > we dont have much of a window. We are hoping to use essentially the whole
> > > > > > > of the upcoming NIRI run (4 nights) so if everything goes perfectly we'll
> > > > > > > get two targets. However banking on a NIRI run going perfectly is probably
> > > > > > > not all that sensible at this stage so maybe we should start one SN with
> > > > > > > ISAAC now.
> > > > > > >
> > > > > > > However I am confused about when ISAAC is availble.
> > > > > > > Chris wrote:
> > > > > > >
> > > > > > > > Because of this problem, ISAAC has been rescheduled to service until
> > > > > > > >the 18th.
> > > > > > > >The 19th is scheduled as technical and may become service. So there is a
> > > > > > > >small window
> > > > > > > >of opportunity to do one candidate now. Service observing restarts on the
> > > > > > > >23rd.
> > > > > > >
> > > > > > > So What is happening now (19-22nd)? Is that time available? Also is
> > > > > > > "service" time the same as queue, i.e. available to us or not? (Is Tony's
> > > > > > > plan on the web correct now? It shows VLTI commissioning 23,24,25).
> > > > > > >
> > > > > > > The disadvantage of using ISAAC now is that this would mean we have less
> > > > > > > ISAAC time next month, when we dont have NIRI time either. Obviously this
> > > > > > > needs to be decided pretty soon. How is this going to be finialised?
> > > > > > >
> > > > > > > Isobel.
> > > > > >
> > > > >
> > > > > --
> > > > > ___________________________________________________________________
> > > > > Ariel Goobar (ariel@physto.se)
> > > > > FYSIKUM, Stockholm University
> > > > > Stockholm Center for Physics, Astronomy & Biotechnology
> > > > > tel: +46 8 55378659
> > > >
> > >
> > > --
> > > ___________________________________________________________________
> > > Ariel Goobar (ariel@physto.se)
> > > FYSIKUM, Stockholm University
> > > Stockholm Center for Physics, Astronomy & Biotechnology
> > > tel: +46 8 55378659
> >
>
> --
> ___________________________________________________________________
> Ariel Goobar (ariel@physto.se)
> FYSIKUM, Stockholm University
> Stockholm Center for Physics, Astronomy & Biotechnology
> tel: +46 8 55378659
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