From: Lifan Wang (lifan@panisse.lbl.gov)
Date: Fri Apr 23 2004 - 12:49:10 PDT
Hi, Vallery,
Can you make the raw stamp images together with the x,y offset
applied for the drizzle available ?
Cheers,
Lifan
On Thu, 22 Apr 2004, Vallery Stanishev wrote:
> Hi,
>
> I started working on the grism data. On the bottom of the Twikki page
> some figures can be seen. The SN is visible but the signal is very low
> and in addition the spectrum is heavily contaminated by the close bright
> galaxy. Have to find a way to get rid of it before any extraction of the
> spectrum is attempted.
>
> Another problem is that the direct image is too shalow and the position
> of the SN could not be accurately determined. This will affect the
> accuracy of the wavelength solution. I put some rough wavelength marks
> on one of the 2D images.
>
> On the third image (not directly visible from the page) are shown the
> output of Multidrizzle and simpe shift & add. They seem to be almost
> identical. The shifts for the "shift & add" image were determined from
> the 0th orders of 4 bright compact sourses on CCD2. The images were
> shifted by IRAF's IMSHIFT with frac. pixel shifts and interpolation type
> 'drizzle[0.5]'. For the multidrizzle image shifts were not supplied and
> the info comes from the headers (for the moment). PIXFRAC and SCALE 1
> were used.
>
>
> Vallery
>
>
>
> Rachel A. Gibbons wrote:
> > Hi,
> >
> > Tony noticed that in my previous e-mail the days past discovery should
> > read
> >
> > 1) 9 days (~3.5 rest frame days)
> >
> > 2) 13 days (~5 rest frame days).
> >
> > However, my conclusions are based on the correct scaling. Also, to be
> > precise, the data are consistent with discovery at rest B max. Sorry for
> > any confusion.
> >
> > Rachel
> >
> > On Mon, 19 Apr 2004, Rachel A. Gibbons wrote:
> >
> >
> >>Hi everyone,
> >>
> >> It would appear our data are completely consistent with a supernova at
> >>z=1.6 which was discovered at rest-frame optical maximum.
> >>
> >> Here's an update from the first round of follow-up ACS and NICMOS
> >>photometry :
> >>
> >> 1) The discovery z' magnitude was z'=25.1 and 12 days later z'=25.5.
> >>
> >> 2) 16 days after discovery, the new J and H magnitudes are 24.37 and
> >>24.03.
> >>
> >> All mags quoted here are Vega.
> >>
> >> The remainder of the follow-up observations for this candidate will be
> >>in J & H and will extend through 23 May (yes, that's during the next
> >>search run).
> >>
> >> It's unfortunate we're following it on the decline, but it's looking
> >>good! Hooray!
> >>
> >>Rachel
> >>
> >>PS Sorry, no news yet to report on the grism data, except that we have it
> >> and they pointed HST at the right part of the sky.
> >>
> >
> >
> >
>
>
>
-- Lifan Wang (510) 495 2733 (o) (510) 704 0119 (h)
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