[Lofarpwg] LOFAR LTA Cycle LC0-LC6 data retirement; pulsar followup

Fri May 17 10:08:54 UTC 2024

TL;DR: for any timing related cycle 0-6 project, only *.ar files that already exist will be saved. If you want to keep raw data for any project, contact Gemma immediately - see table at the end.

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Hi all,

This email follows a dicussion in the PWG on May 6th.

As you know, the early LOFAR1 data from Cycle 0-6 is up for retirement/deletion from the LTA.

For the PWG, there have been two efforts to request data products for safekeeping;
1) Any pulsar timing related projects
led by Caterina Tiburzi, now taken over by Gemma Janssen and Joris Verbiest
2) Any pulsar or transient searching related projects
led by Jason Hessels

We provided lists of the projects to ASTRON SDCO and since mid-April, we are provided with download links on a project-by-project basis. ASTRON is staging each project separately with a few-week window for downloading, after which the project gets ‘unstaged’ and another project is staged.

Now that we are actively downloading the data, it turns out that the Data Volume per project is varying massively, depending on which data products are in the LTA.

1) For the “pure” pulsar timing projects, the data volumes are very small; we intend to ONLY keep the *.ar archive files, one per observation. This still has some frequency and time resolution (400 subbands and typically 5-s subintegrations, depending on the pulsar).

1) For other “potentially timing-related" projects, there is only raw data available, which is large to download and will need to be processed first to be valuable for timing purposes first.
==> We decided that for 1), this is not worth the effort.

Please see the table below or the notes in the PWG minutes google doc
https://docs.google.com/document/d/1wgKrdikAEVhk1utEqo4H0TSuy6FzmdtJbtYVGrCG9c0/edit

If you are interested in keeping any data of the projects listed in the table that are orange or red, this is still possible; however, you will be responsible yourself for finding storage space and downloading the data when it is staged by ASTRON SDCO.

Contact us ASAP if this is the case. If we don’t hear from you, we will NOT download these data and they will disappear from the LTA sometime in the coming months.

2) for information on pulsar or transient searching related projects, contact Jason Hessels.

Kind regards, on behalf of Caterina and Jors,
Gemma

LOFAR projects requested for downloads from LTA LC0-LC6
Green: will be downloaded by Verbiest/Tiburzi/Janssen. Only archives will be saved.
Red: will NOT be downloaded by Verbiest/Tiburzi/Janssen. Contact Gemma if you want to download a project yourself.
Orange: will be downloaded by Verbiest/Tiburzi/Janssen. If there already are archives, those will be saved. If there is only raw data, nothing will be saved. If you are interested in (potential) raw data files, contact Gemma.

IF THERE IS A TRANSIENT/FRB/SEARCH PROJECT, or another pulsar project that is not in this list that you are interested in, contact Jason Hessels.

Long-term timing programmes
Description
Original PI
Notes
LC0_011
Pulsar timing with LOFAR
Verbiest

LC1_027
Pulsar Timing with LOFAR
Verbiest

LC2_010
Pulsar Timing with LOFAR
Verbiest

LT3_001
Pulsar Timing with LOFAR
Verbiest

LC4_004
Pulsar Timing with LOFAR
Verbiest

LT5_003
Pulsar Timing with LOFAR
Verbiest

Follow-up Timing
Description
Original PI
Notes
LC0_022
LOFAR timing of pulsars and rotating radio transients discovered in GBT 350-MHz surveys
Ransom

LC1_035
Continued LOFAR Gridding/Timing of Discoveries from the GBNCC Pulsar Survey
Unknown

LC2_007
Continued LOFAR Timing of Discoveries from the GBNCC Pulsar Survey
Lynch

DDT5_003
Determining the properties of the first millisecond pulsar discovered by LOFAR
Pleunis

Solar Wind
Description
Original PI
Notes
LC3_035
Simultaneous extremely wide-bandwidth pulsar observations near Solar conjunction
Janssen
With WSRT. J0034-0534, J0030+0451, J0304+1932, B2045-16, J2145-0750, J2051-0827
LC4_003
Simultaneous extremely wide-bandwidth pulsar observations near Solar conjunction
Janssen
With WSRT.
J0943+1631, J1022+1001, B0950+08, B0531+21, J0407+1607

Eclipsing Binaries
Description
Original PI
Notes
LC2_039
LOFAR Observation of Eclipsing Binary Pulsars
Breton
J1810+1744, B1957+21, J2215+5135, J2129-04, J2051-0827, J1544+4937, J1816+4510
LC3_032
LOFAR Observation of Eclipsing Binary Pulsars
?
0 data products?

Pulsar-Specific
Description
Original PI
Notes
LC3_013
A low-frequency study of the bright pulsar B1237+25
Maan
2 obs
LC5_018
The Low-Frequency Profile of the Recycled High-Energy Pulsar J1614-2318
Mikhailov

Other Projects
Description
Original PI
Notes
LC0_008
LOFAR studies of pulsars, fast transients and the interstellar medium
Stappers

LC1_003
A Full Census of the Known Pulsar Population at LOFAR Frequencies
?

LC1_020
Monitoring of the Crab pulsar
Wucknitz
Raw data only
LC2_025
A Full Census of the Known Pulsar Population: Extension to the Lowest Radio Frequencies
Bilous

LC2_026
Millisecond Pulsar Scintillation: a Pilot Study
Stinebring
B0950+08, J1012+5307, B1133+16, J1022+1001, J1810+1744, B1937+21, J2145-0750, J2317+1439, J0030+0451
All several obs
LC4_019
The Three Low-Frequency Drift Modes in the Harmonic Pulsar
Unknown
2 obs, probably raw data only
LC4_021
Probing pulsar magnetospheres at 10-90 MHz with LOFAR
Ulyanov
B0809+74, J0242+62, B0329+54
Raw data only
LC4_032
High precision RMs from LOFAR observations of pulsars with parallax measurements, towards accurate reconstruction of the Galactic magnetic field
Sobey
Multiple; pulp
LC5_003
Probing pulsar magnetospheres at 10-90 MHz with LOFAR (Part II)
Ulyanov

LC6_028
LOFAR-LWA observations low-lat pulsars
Kondratiev
Multiple; pulp
LC6_030
Monitoring Continuum and Beamformed Pulsar Flux Density
Breton
Multiple; pulp
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