Re: 000911 data

[Chris Albertson <chrisja@jps.net>]

Arne,

It takes me about two and a half minutes to down load
each image.  Not bad.  That means I could transfer all
of the raw data from a remote camera in real-time.  Still
it could be better.  I used gzip to compress the files
and notice they compres down almost 3:1.  It would be
then, almost three times faster for all involved if you
would compress the images at your end.  I just used
  gzip --best xxxxx.yyy
gzip is pretty universal and even people with Windows PCs 
can read the .gz files

I was surprized to see that level of compression with a
lossless compressor like gzip but I guess the dark/flat
processing removes some noise and the full 16-bit pixel range
is not used.

aah@nofs.navy.mil wrote:
> 
> I'm slowly transferring images onto our anon ftp site
> (the link through the firewall is really slow).  The
> files are 16bit FITS, on directory
> ftp://ftp.nofs.navy.mil/pub/outgoing/aah/tass
> with filenames like
> 000911va.122
> 000911vb.122




> ...
> 000911va.123
> 000911vb.123
> ...
> where 122 = right ascension strip number
> a-h are the individual frames within that right
> ascension strip, and 'v' indicates V-bandpass.
> These frames are all dark subtracted, trimmed and flattened.
> The Right Ascension for 122 is about 01:44, and
> for 123 is about 02:16.  The declinations are probably
> north of -8 degrees and south of +40 degrees.  Other than
> that, you are on your own to find where the TASS camera
> was pointed!
>   The GRB was at 02:18:42 +07:48:30.  The frame that
> should have covered that field is 000911ve.123, but I
> couldn't identify the field.  I think the drive got
> stuck at pretty high declination, but that is a guess.
> The ftp process just finished 000911vb.123, taking
> 3 minutes per frame to transfer!  Something has changed
> on our internal network, and I'll have to complain to
> the sysadmin tomorrow.
>   It is clear again tonight; I'll be taking a couple of
> hours on CY Aqr before continuing the photometric survey.
>   Richard C. has offered to identify these fields, but
> I think the more brainpower the better.  It is kinda fun
> to be using the BD charts after 30 years.  We don't even
> own a Millenium atlas here, but that would be just about
> ideal for the Mark IV.
> Arne

-- 
   Chris Albertson             home: chrisja@phoenixdsl.com  
   Redondo Beach, California   work: calbertson@primeadvantage.com