Deletion Round 2025-06 (Complete)
Introduction
This is the third deletion round and supports the Data Retention Policy/Procedure in ensuring capacity is available for new observations in the 2025A observing semester by removing the oldest, and/or least valuable data in the archive. Since the 2025A semester runs until March 2026, and the array now supports up to 256 tiles, the volume of data nominated in this deletion round (8.5 PB) is, by necessity, larger than previous rounds.
Process
Please use this four week consultation period to carefully review the below information. This delete round includes observations across many different projects/proposals so it’s important that you check the below lists carefully!
If you would like some or all the data for a delete request retained, as per the policy/procedure, please prepare a submission in writing to the MWA Director before the end of the consultation period and include:
the dataset in question (please be as specific as possible: include the obsid(s) and delete request number(s) if possible);
the reason(s) for temporary retention of the dataset- for example, the significance of the dataset, the data retention requirements of the researcher’s institute, and the proposed plan for copying and storing the dataset offsite.
total size of the dataset to be retained
The MWA Director (or delegate) will then assess the request for retention and will respond in writing. Please note that any of the data approved for retention will not be deleted this round.
If you have any questions about the data nominated for deletion or this process, please reach out to the Principal Scientists.
Summary by Delete Request
Below is a summary of each delete request. You can see more details on each request by clicking on the Delete Request number hyperlink.
Delete Request | Requested by | Delete Request Name | Data volume (TB) to be deleted | Observations to be Deleted | Notes/Comments |
|---|---|---|---|---|---|
Greg Sleap | Remove all calibrator observations from pre-July 2013 (commissioning) | 79.441 | 5237 (view) |
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Greg Sleap | "C" Project observations prior to 2025 (some obs excluded) | 578.849 | 2214 (view) |
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Greg Sleap | G0034 Shadow Parkes and Shadow ASKAP observations | 2,089.352 | 20445 (view) |
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Natasha Hurley-Walker | Unneeded G0092 VCS Data (PI nominated via email) | 1,032.690 | 145 (view) |
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Chenoa Tremblay | G0018 Detecting Molecular Lines with the MWA (VCS data only) | 42.189 | 18 (view) |
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Colin Lonsdale | G0019 Investigation of non-closing digital effects in the MWA correlator (VCS data only) | 2.024 | 1 (view) |
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Steven Tremblay | G0024 FRBs with the MWA (VCS data only, some obsids excluded) | 2,631.524 | 166 (view <June 2015, view Jun-Dec 2015, view 2016, view >=2017) | NOTE: the following obsids were approved to be retained by MWA Director: 1195038136, | |
Ramesh Bhat | G0034 Shadowing Parkes FRB observations (VCS data only) | 4.710 | 3 (view) |
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Bradley Meyers | G0038 Sporadically Emitting Pulsars at Low Frequencies (VCS data only) | 30.646 | 4 (view) |
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Ramesh Bhat | G0061 MWA follow-up of a FAST pulsar candidate (VCS data only) | 85.223 | 2 (view) |
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Avinash Deshpande | G0063 Coordinated MWA-GBD search for radio pulses from the Geminga Pulsar-Radio pules from the Geminga Pulsar (VCS data only) | 106.761 | 5 (view) |
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Hongyu Gong | G0066 Scattering of intermediate dispersion pulsars-Intermediate dispersion pulsar scattering (VCS data only) | 86.206 | 2 (view) |
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Charlotte Sobey | G0068 Targeted pulsar search towards promising candidates identified in radio surveys (VCS data only) | 201.528 | 18 (view) |
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Alexander Williamson | G0070 Detecting cosmic-ray extensive air showers (VCS data only) | 512.316 | 18 (view) |
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Zhongli Zhang | G0089 A Pioneer Search for Pulsars in Low Frequency in Globular Clusters (VCS data only) | 90.807 | 1 (view) |
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Yogesh Maan | OA002 Using the MWA for Confirmatory Detection, Localization and Study of the Lowest Dispersion Measure Pulsar (VCS data only) | 38.028 | 2 (view) |
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Gemma Anderson | G0055 Proposal for MWA rapid-response observations of GRBs (VCS data only- specific obsids only) | 194.949 | 18 (view) |
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Greg Sleap | C001 Engineering test observations (2025 Jan-Apr) | 11.704 | 111 (view) |
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Stefan Duchesne | 2017 August to October Phase II observations with <50% good tiles (i.e. array transition period) | 373.694 | 5225 (view) |
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Stefan Duchesne | All Uncategorised DDT (D0000) prior to 2021 | 270.371 | 5723 (view) |
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Stefan Duchesne | Observations prior to 2014, excluding D0006, C*, G0008 and G0009 projects | 121.516 | 1261 (view) | All G0002 observations requested and accepted by Director for retention (per request from John Morgan) | |
John Morgan | Specific Observations within G0060 | 13.064 | 48 |
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TOTAL |
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| 8,499 | 40,675 |
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Summary by Project/Proposal
Project ID | Project Description | Data volume (TB) to be deleted | Observations to be Deleted | Delete Request(s)- click to view obs |
|---|---|---|---|---|
C000 | Nightly picket fence calibrator observations for monitoring receiver health, and commissioning new receivers. | 0.508 | 4 | |
C001 | Default | 580.339 | 2120 | |
C100 | Short (~2min) scans on strong calibrator sources. Freq: 80-250 MHz. LST range: all. Subarrays: all | 59.637 | 3259 | |
C101 | The Southern Continuum Interferometric Snapshot Survey Of the Radio Sky. Freq: 104-195 MHz. LST range: sunset to sunrise. Subarrays: all. | 2.838 | 470 | |
C102 | Night-time drift scans at zenith (DEC -27). Freq: 104-195 MHz. LST range: sunset to sunrise. Subarrays: all. | 19.474 | 981 | |
C103 | Night-time drift scans at DEC -47, az=180. Freq: 104-195 MHz. LST range: sunset to sunrise. Subarrays: all. | 1.491 | 241 | |
C104 | EoR fields | 2.729 | 178 | |
C106 | Tracking observations of the Sun, often from rise to set. Freq: 80-230 MHz, 270-300 MHz. Subarrays: all. | 0.524 | 5 | |
C110 | Moon imaging and RFI | 0.011 | 3 | |
C111 | LMC | 0.491 | 80 | |
C112 | W44 Galactic plane field. Freq: 80-230 MHz | 1.401 | 82 | |
C113 | Galactic micro-quasar. Freq 80-230 MHz. Available Aug/Sept. *Note within C112 field. | 0.518 | 41 | |
C118 | Freq: 80-230 MHz | 0.049 | 8 | |
C119 | Freq: FM band, central chan 81. | 0.006 | 1 | |
C120 | Fixed DEC scan at DEC -6 (corresponding to a sweet spot pointing) | 0.434 | 75 | |
C122 | A3376 (RA 6, DEC -40), A3667 (RA 5:49, DEC -24:28) and the Bullet Cluster (RA 7, DEC -56) | 0.547 | 14 | |
D0000 | Catch-all for Director's time observations that don't have a project ID. | 270.161 | 5723 | |
D0002 | Test observations for non-standard correlator modes using high time and/or frequency resolution. | 7.937 | 88 | |
D0005 | Tests of the prototype AAVS0.5 tile. | 0.664 | 28 | |
D0009 | Immediate follow-up of GRB events. | 1.083 | 16 | |
G0001 | (Bell) The MWA long-term radio sky monitor | 33.659 | 772 | |
G0002 | (Cairns) Unbiased Solar Observations for Burst, Calibration, and Quiet Sun Studies | 0 | 0 | 97 all G0002 observations requested and accepted by Director for retention (per request from John Morgan) |
G0003 | (Hancock) Exploiting the MWA field of view to study scintillation and the structure of turbulence in the Milky Way. | 5.99 | 126 | |
G0008 | (Staveley-Smith) A Galactic and Extragalactic All-Sky MWA Survey | 102.049 | 1705 | |
G0010 | (Ewall-Wice) Constraining Xray and Dark Matter heating Before the Epoch of Reionization (EoR): Preliminary Observations at Low Frequency with the MWA | 11.43 | 255 | |
G0017 | (McKinley) Using the Moon to detect the global EoR signal. |