4–6 October 2023

Osservatorio Astrofisico di Torino, Turin, Italy

GaiaUnlimited Community Workshop 2

The Gaia selection function and how to use the GaiaUnlimited tools


The workshop's theme is the Gaia selection function and how to use it. This event will be a three-day workshop and unconference, where we will discuss and learn from each other about the finer details of the Gaia selection function and how to build and use it in various contexts. Participants will be working with the new GaiaUnlimited selection function tools, for which we will assist as needed, and we will improve them based on the feedback we'll receive. We hope this workshop could lead to some new collaborations or initial joint studies. We want to dedicate a significant amount of time to unconference sessions and informal discussions.

New in this workshop: Selection function tools for subsamples of the Gaia data and for combinations of Gaia with other photometric and spectroscopic surveys.

This workshop is partially funded by the European Union’s Horizon 2020 research and innovation program under grant agreement No 101004110.



The Gaia Unlimited Team

  • Adrian Price-Whelan (Flatiron)
  • Alfred Castro-Ginard (Leiden)
  • Andy Casey (Monash)
  • Anthony Brown (Leiden)
  • David Hogg (NYU/ Flatiron/ MPIA Heidelberg)
  • Hans-Walter Rix (MPIA Heidelberg)
  • Morgan Fouesneau (MPIA Heidelberg)
  • Ron Drimmel (INAF-Torino)
  • Shourya Khanna (INAF-Torino)
  • Tristan Cantat-Gaudin (MPIA Heidelberg)
  • Vasily Belokurov (IoA Cambridge)


The registration is open until June 15 2023.

Please use the registration form. We estimate that it will take 15-30 minutes to complete. We aim to select a group of about 40 participants with a broad range of expertise and interests. We will also balance the distribution across geographical locations and career stages while including underrepresented groups.

Participants notified on July 1 2023.

Participation confirmation by July 15 2023.

We will later list here the participants of the workshop, and we will add a group picture.


The program is preliminary and will be updated soon.


08:30 - 09:00 Participants arrival
Registration, name tags, etc.
09:00 - 09:10 boot-up
Welcome and opening remarks
09:10 - 10:40 Pitch cards
Individual one slide introductions slide deck
10:40 - 11:00 Coffee break
11:00 - 12:00 Session 1 - The Gaia selection function & GaiaUnlimited project
12:00 - 13:00 Lunch break
13:00 - 13:50 Session 2 - Use cases of Gaia SF and complications
13:50 - 14:00 Daily Unconference Planning
Unconference topic selection and room allocation
14:00 - 15:50 Unconference and Tutorials
Tutorial on the GaiaUnlimited tools
15:50 - 16:10 Coffee break
16:10 - 18:00 Unconference and Tutorials
18:00 - 18:30 Wrap-up
Reports on the unconference sessions. Sharing results and feedback.
Reception (at the workshop venue)


09:00 - 09:10 boot-up
Welcome and opening remarks
09:10 - 10:00 Session 3 - Contributed Talks
09:10 - 10:00 Hack time
Experiment various selection functions.
10:30 - 11:00 Coffee break
11:00 - 12:00 Session 4 - Contributed Talks
12:00 - 12:10 Daily unconference planning
Unconference topic selection and room allocation
12:10 - 13:30 Lunch break
13:30 - 15:45 Unconference and Tutorials
15:45 - 16:15 Coffee break
16:15 - 17:30 Unconference and Tutorials
17:30 - 18:00 Wrap-up
Reports on the unconference sessions. Sharing results and feedback.
Dinner at TBD
19:00 - 19:30 Wrap-up
Reports on the unconference sessions. Sharing results and feedback.
19:30 - 20:00 Outlook for day 3


09:00 - 09:10 boot-up
9:10 - 10:30 Unconference and Tutorials
10:30 - 11:00 Coffee break
11:00 - 12:00 Session 5 - Contributed Talks
12:10 - 13:00 Lunch break
13:00 - 13:10 Final logistics
13:00 - 14:20 Unconference and Tutorials
14:20 - 14:40 final wrap-up
14:40 - 16:00 G-U feedback and Gaia SF perspective
GaiaUnlimited: feedback and perspectives, by Anthony Brown
16:00 - Conference closed


The workshop will take place at the Istituto Nazionale di Ricerca Metrologica (INRiM) — Laboratorio Alte Tensioni e Forti Correnti.


The INRiM is close to the physics department of the University of Turin, on the edge of the Parco del Valentino on the Po river. It is within easy reach by public transport from the main train stations in Turin.

Don't hesitate to contact us if you need any assistance or have any questions.


Istituto Nazionale di Ricerca Metrologica

Corso Massimo D'Azeglio 42

Turin, Italy


The workshop will start at 09:00 on Wednesday, October 4 2022, and finish at 16:00 on Friday, October 6 2022.

Participants are responsible for organizing their travel to Turin and should make their own accommodation arrangements (see below).




If you need help with childcare arrangements, don't hesitate to contact us.

Lunches & Coffee Breaks


Workshop dinner



We are committed to providing an accessible environment for all participants. If you need help or arrangements, don't hesitate to contact the organizers.

Participants will pay attention not to leave out information for some people in your audience. Some of us might not be able to see well, hear well, move well, speak well, or understand information presented in some ways well or at all. Everyone at the event will be open to diversity in the audience and any accessibility issues. The Web Accessibility Initiative provides some information & directions.

Covid-19 measures

Please read the safety measures and guidelines for this workshop.


Participants are responsible for making their own accommodation arrangements. More details will follow soon.

don't hesitate to contact us if you have any questions.


This workshop is an in-person event. In addition, we will use:



You may need to apply for a visa to enter Italy. See this overview of visa requirements.

Feel free to contact the organizers if you need a letter of support.

Getting to Turin

Driving directions

The center of Torino is restricted access (ZTL; Zona traffico limitato). Check with your hotel to make sure that they have available parking, and whether you need a temporary permit to reach them.


The two main train stations are Porta Nuova and Porta Susa. Assuming you are staying in a hotel near Piazza Vittorio, the most convenient public transport lines from Porta Susa are tram 13 or 13/ (dir Gran Madre), bus 55 (dir. Farini), or bus 56 (dir Tabacchi), while from Porta Nuova you will want to take bus 61 (dir San Mauro), but be aware that the bus stop for this line is not directly in front of the station, but on the east side of the station along Via Nizza. For the name of the bus/tram stop nearest your hotel, please check the hotel's website. Or you can easily get a taxi.


If you arrive at the Torino airport, there are several ways to reach downtown Torino. The cost of a taxi to the city center is about 30 euro and takes about 30 min, or you can take a SADEM bus which makes stops near the two train stations mentioned above. The SADEM bus runs every 15min (between 7:00 and 19:30, last bus at 23:30), takes about 45/50min to reach the city center, and costs 6.50 euro if you buy the ticket inside the airport.

There is a train station at the airport, but it is not convenient for reaching the city center.

Getting to the venue


Exploring Turin


Code of conduct

During the community workshop, we require participants to follow the code of conduct for the workshop which can be found below. If you have any questions about the workshop, you can reach the organizing committee.

The organizers are dedicated to providing a harassment-free conference experience for everyone, regardless of gender, gender identity and expression, age, sexual orientation, disability, physical appearance, body size, race, ethnicity, religion (or lack thereof), or technology choices. We do not tolerate harassment, abusive behavior, or intimidation of conference participants in any form. As such, we follow the European Astronomical Society Council (EAS) Ethics Statement and Guidelines for Good Practice and expect all participants to read and abide by their statements.

In addition to a general Code of Conduct and Ethics, all participants must agree with our collaboration policy: i.e., to openly share their ideas, expertise, code, and interim results. Project development will proceed out in the open among participants.

Participants are encouraged to change gears, start new collaborations, and drop or combine projects. Any participant contributing significantly to a project can expect appropriate credit vessels (e.g., co-authorship).

We pledge to help the entire community follow the code of conduct, and to not remain silent when we see violations of the code of conduct. We will take action when members of our community violate this code such as notifying a workshop organizer or talking privately with the person. This code of conduct applies to all community situations online and offline, including the conference itself, mailing lists, forums, social media, social events associates with the conference, and one-to-one interactions.

Participants asked to stop any harassing behavior are expected to comply immediately. Attendees violating these rules may be asked to leave the event at the sole discretion of the conference organizers.