POSSUM Status Monitor
The survey status, both for the observations and the pipelines, are shown below.
There are also Aladin overlays that show both the observations and tiles.
The observation status figures show the status of each field planned for both the surveys
POSSUM is commensal with: EMU (band 1, 800-1088 MHz) and WALLABY (band 2, 1396-1440 MHz).
These bands are processed completely separately, so their data status is shown separately.
A figure showing the sky area overlap of the two bands is shown below.
Observations progress through several stages:
Some fields are observed as two separate observations. These are marked as semi-circles, which show the status of each observation.
- Planned: part of anticipated survey footprint
- Observed: observation has been scheduled (possibly completed).
- Observatory Processed: the observatory pipeline has completed; the data is awaiting validation.
- Rejected: POSSUM has rejected the data as below our quality standards.
- In band 1, this will make the observation eligible to be repeated at some future date.
- In band 2, re-observations are not possible. If both interleaves are rejected, the sky coverage will be lost.
- Released: The observation has been validated by POSSUM and released to the public by the observatory.
From this point forward, the data are available to everyone.
- AusSRC Processed: The observation has been ingested by the POSSUM-AusSRC
pipeline, which produces science-ready products. These products may be available (check the tiling maps for details).
The POSSUM-AusSRC pipeline breaks the data into smaller tiles (approximately 3.5 square degrees)
and performs additional useful processing steps that we consider essential prior
to polarization analysis. The tiles are available through POSSUM and are used in the analysis pipelines.
The tiles likewise progress through several stages of processing and analysis:
the tiles expected for the full survey area,
those that have been produced by the mosaicking step of the POSSUM-AusSRC pre-processing pipeline,
and those processed by the POSSUM 1D and 3D analysis pipeline.
Full processing with the 1D pipeline is only possible when all the neighbouring
tiles are also mosaicked.
- Incomplete: we are still waiting for ALL observations that contribute to this tile to be observed.
- Mosaicked: All contributing observations have been mosaicked together to
produce the final frequency cube tiles. These tiles are made immediately available
to all POSSUM members, and members of the public after a proprietary period.
- 1D processed (core): the main part of the tile (i.e., away from the edges) has gone through the 1D (catalog) pipeline
Edges and corners not yet processed (waiting on neighbouring tiles)
- 3D processed: the tile has gone through the 3D RM-synthesis pipeline
- Fully Processed: the 3D pipeline has been run, and the 1D pipeline has run on the main body of the tile as well as all edges/corners
The data shown in the figures below is also available in tabular form on
this Google Sheet.
Full survey - band 1 (EMU-commensal)
EMU fields are a single 10-hour observation through the main body of the survey,
and 2x 5-hour observations above a declination of -12 deg. Each 5 hour observation
is processed independantly (and shown as a half-circle).
Full survey - band 2 (WALLABY-commensal)
WALLABY fields are observed as 2x 8-hour observations with a slight coordinate
offset between each observation; each is processed independently (and shown as
Note that the observatory will not re-observe WALLABY fields that are rejected
by POSSUM for poor data quality. Over time, this may introduce holes in the
survey coverage if we are unlucky enough to reject both observations of the
Survey overlap regions.
The following figures show the approximate sky coverage of both bands,
highlighting regions in which both bands have been observed. The plots come
with several caveats:
- Only three possible data states are checked:
- Region inside planned survey footprint
- Field observed (at least once -- interleaves not checked) and validated
- Tile (frequency cubes) have been produced by science-ready pipeline
- For the observed and validated state, the sky area coverage is optimistic;
it may be that the observations between both bands are adjacent but not overlapping.
- The Aladin lite view has a more accurate representation of the sky coverage
of the observations, although this representation is slightly pessimistic --
there will be more overlap than the overlay suggests.
Pilot - band 1
Pilot - band 2