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KPNO, Jan 2000
This page contains REAL-TIME information on detections of
transient astronomical happenings from the Deep Lens survey, currently
being undertaken on the KPNO 4-m telescope using the wide-field MOSAIC
imager.
A by-product of this wide-field survey is the detection of
transient astronomical phenomena, including Near Earth Objects (NEO),
Kupier Belt Objects (KBO), Supernova (SN), and even previously unknown
events which happen with such rarity that only a wide field and deep
survey, such as this one, are even reasonably sensitive to them.
The table below contains recently updated information on objects
detected during the course of this survey. These are extracted from
the images in real-time using a combination of SExtractor
for object detection and ISIS to provide
differenced images, from which we are able to identify transient, or
"new", objects, after filtering out spurious objects like cosmic rays.
These objects have also been inspected by eye and categorized as probably real.
We include the date, DATE-ARCH, when the object was added to this
archive or updated, the date the object was observed DATE-OBS (MJD),
and the FILTER of the discovery observation. Additionally, we include
the RA and DEC (J2000, to ~0.5'' accuracy) of the object, and a
preliminary categorization of the nature of the transient, and
a preliminary estimate of the magnitude of the transient (+/-
0.5 mag). Two types of images are available for download:
mosaics and finding charts.
The mosaics are GIFs showing three 200-pixel (50") postage stamps: the
discovery image on the top, the template image in the middle, and the
subtraction of the two on the bottom. In a few cases the subtraction
is not available and the time evolution across many images is shown
instead, with time increasing from bottom to The files are generally a
few hundred kilobytes.
The finding charts are 3'x3' FITS images centered on the discovery
position. The time in the header is the start of the exposure and the
world coordinate system in the header is accurate to 0.5" (but note that
on the nights of Jan. 28-20, the WCS had some glitches of up to 10").
The files are 1 MB. The images are zero-padded to maintain the object in
the center even if it was near the edge of the discovery image.
Your browser may not bring up saoimage/ximtool automatically on
the FITS file. Right-click on the link to save to local disk.
For moving objects, a finding chart is useless, and instead we provide an
ASCII list of positions and times.
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