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ATCA Release notes for 2018APR

ATCA observing: The default observing location for all ATCA observations is the Science Operations Centre (SOC) at the ATNF headquarters in Marsfield, Sydney. Observers no longer have the option of travelling to Narrabri to conduct routine observations. First-time observers are required to observe from the SOC, where they will be supported by the Duty Astronomer (DA) and Operations staff. Observers who wish to travel to the observatory for their observations may do so (although limited space is available at the on-site lodge), but support is limited to that given to any other remote observer.

The Duty Astronomer role is now based at the SOC, and the DA will be present on-site for first-time observers and be contactable at all times, but may provide support from other locations for remote observers (i.e., remote from the SOC).

The present annual requirement to observe from the SOC in order to be "remote qualified" will be retained for most observers. Regular, competent observers (typically, people observing on at least three separate occasions or for more than 10 days per semester) can extend the time between their return visits by 6 months.

The Marsfield site has a Lodge which is able to provide on-site accommodation for observers and DAs. Please use the new webform to book at least two weeks in advance to ensure a room is available. That webform may also be used to book accommodation at the observatory lodge in Narrabri.

ATCA Legacy Projects: CSIRO Astronomy and Space Science implemented a program of ATCA Legacy Projects starting from the 2016OCT semester. Legacy Projects are large, coherent science investigations, not reproducible by any combination of smaller projects, that generate data of general and lasting importance to the broad astronomy community. More details are available from the Legacy Project webpage. The call for Expressions of Interest proposed that Legacy Projects would be supported at the level of 25% of the available observing time. As there is some uncertainty over the funding of the ATCA into the future, the TAC was advised that ATNF would be willing to support Legacy Projects at a higher level. For this semester, legacy projects have been awarded 1197 hours of telescope time, from an available 4371 hours.

The TAC recommended two projects be given the highest priority: C3132, "GAMA Legacy ATCA Southern Survey (GLASS): A Legacy 4cm Survey of the GAMA G23 Field" and C3157, "Deep Imaging of the Circum-galactic Medium with ATCA." The TAC also recommended that two further projects be supported at a lower priority: C3145, "Dense Gas Across the Milky Way -- The 'Full-Strength' MALT45" and C3152, "A Comprehensive ATCA Census of High-Mass Cores." All four legacy projects have been allocated time in 2018APR.

ATCA portal: The portal is a web-based tool that enables the observers to book in advance for observing blocks and to register as the current observer-in-charge. It also provides alerts, contact details, and a improved chat facility over that previously used in the ATCA observing VNC session. More details are available from the ATCA Current Issues webpage and the ATCA User Guide. First-time users should refer to the ATCA Portal Beginners Guide.

Radio Frequency Interference (RFI): There is a new strong emitter in the 16cm band in the 2630-2670 MHz range, a previously relatively clear part of the spectrum often used by 16cm-band observers for their delay calibration. Instructions for dealing with this are are available from the ATCA Current Issues webpage. RFI in the 16cm band also causes the sampler statistics to fluctuate, and the automatic attenuator setting often does not work. A set of standard attenuator settings for the 16cm band has been determined and these can be manually set -- see section 3.2.2 of the ATCA User Guide for more details. (If they have been set by a previous observer, it may not be necessary to set them again.)

There is also some RFI in the 15mm band in the frequency ranges 17.7--18.2 GHz, 18.8--19.3 GHz and 19.7--20.2 GHz which arises from a geostationary satellite and is stronger towards equatorial declinations. See the ATCA Current Issues webpage for more information.

RFI in the 16cm band cannot yet be mitigated on-line, but a new mode in the correlator allows observers to more easily mask its effect on the diagnostic visibilities, using median averaging. Instructions on how to do this can be found from the ATCA Current Issues webpage.

CABB modes: All current CABB modes will be available for the 2018APR semester: (1) the 1MHz continuum ("no zooms") mode, (2) the 1MHz zooms mode (1M-0.5k), with up to 16 zoom bands per IF available, (3) the 64MHz mode (64M-32k), which provides 32 channels of 64MHz bandwidth and up to 16 zoom bands (each having 2048 channels across it) in each IF (4) the "hybrid" mode, with 2048 x 1MHz channels in IF1 (and no zooms) and 32 x 64MHz channels in IF2 (with zooms), (5) the pulsar binning mode, (6) the VLBI tied-array mode. See the CABB webpage for more details. CABB mode changes are mostly routine, except for changes to the 1MHz zoom mode, 64 MHz zoom mode, and hybrid mode, which require approximately one hour: this mode change is done by local staff or suitably trained others. In the graphical version of the schedule the requested CABB mode is shown in the top right corner of each block.

NAPA Proposals: A number of NAPA (Non A Priori Assignable) proposals have been submitted for ATCA in 2018APR. We have a policy for dealing with NAPA over-rides, intended to ensure highly time-critical projects can be scheduled on the telescope. For the 2018APR semester, any NAPA which received a grade equal to or higher than the grade at which most of the projects got most of their time, will be able to over-ride any scheduled project. For this semester, fifteen of the sixteen NAPA projects meet this criteria. The sixteenth NAPA project may still be triggered, but will only be allocated green time if possible.

If triggered, observatory staff will discuss with the proposers the best time for the over-ride to occur, which may not necessarily involve any project being displaced. Requests to trigger a NAPA proposal can be made by emailing the ATNF alert group, as described here.

Any observations displaced by a NAPA will be rescheduled if possible, but this is not guaranteed.

There are two NAPA projects that are authorised to use the rapid response service. Rapid response over-rides may occur at any time without staff or observer intervention.

Green Time: Green time should be requested through the Portal. Instructions for doing this can be found in the "Book" tab in the Portal. Requests for green time can be made at any time during the semester, but the final allocation will not be made until 1 week beforehand.

If you are requesting green time for a project that was not ranked by the TAC for this semester, please also email Jamie Stevens ( with a summary of what you are requesting to observe.

Daylight Saving: Daylight saving in New South Wales will end at 3:00am (AEDT) on Sunday, 1st April 2018, when clocks will be put back one hour. AEST is 10 hours ahead of UTC. Daylight saving in New South Wales will begin at 2:00am (AEST) on the first Sunday in October 2018.

Public Holidays: Sunday/Monday April 1/2 are public holidays throughout Australia, for Easter Sunday and Monday. Wednesday April 25 is an Australian public holiday for Anzac Day. Monday June 11 is a NSW public holiday for the Queen's Birthday.

Version history: Version 1 of the schedule was released on 2018 March 1st.

Generated: Jamie Stevens (27-apr-2018)