Date: Sat, 30 Dec 2017 23:51:15 -0000
Subject: Re: [sloan-25mlog 3820] Re: 2.5m obslog 20171229 (SJD 58117)
From: "Dmitry Bizyaev"
Hi Dan,
yes, this plate shows consistent behavior like this. The full reduction
pipeline usually makes up good S/N for it, so we expect that it will be
fixed on its own in a few days, even is nobody from APOGEE responses.
Dmitry
> Hi Karen and Dmitry,
>
>> * ATTN APOGEE: Apogeeql webapp is showing S/N=0 for a few dithers on Cart
>> 8
>> (Plate 9690).  The sky is completely transparent, and we have not lost
>> guide
>> stars.  Is something wrong with the quickred?  Completion progress on
>> Plate 9690
>> is unknown.
>
> It must be something specific to 9690 because we saw the same thing when
> we observed 9690 back on Dec. 9th. Here was the comment from the Summary
> that night (but I don't think there was ever a response as to the cause):
>
> "(2) Four of the exposures on plate 9690 have QR SN2 exactly `0', but the
> images look OK and the SN2-vs-Read # plots also show non-zero signal."
>
> Dan
>
>
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