Questions and Answers


"Short talks" and "Posters".

Each person can have maximum 3 abstracts they pay for. It is ok to be co-author of several others.
The email address of the person paying for the contribution is supposed to be the main contact for the presentation.

Your contribution will be scheduled either in one of the parallel discussion sessions or the presenter forum. You are expected to be present to answer and explain.
The preliminary timetable will be available in June.

We have two types of contributions: “talks” and “posters".

for talks we expect

  • a 12-min pre-recorded talk (.mp4 file)
  • the slides for this talk (.pdf)
  • a one page executive summary (.pdf)
  • an up to 8-page proceedings article (.pdf upload to proceedings page)

for posters we expect

  • a one-page classical poster, 16:9 landscape (.pdf)
  • a 2-min pre-recorded flash talk (.mp4 file)
  • the slides for the flash talk (.pdf)
  • a one page executive summary (.pdf)
  • an up to 8-page proceedings article (.pdf upload to the proceedings page)

One page executive summary
What is this contribution about?
Why is it relevant / interesting?
What have we done?
What is the result?
One short sentence each. The executive summary should not last more than a minute. It is not meant to be a part of the proceedings. It is meant to be used to introduce a contribution in the discussion session or the presenter forum.
Not least, it may be the first thing someone reads to decide whether it is worthwhile  go through the slidesor watch the recorded talk.

Pre-recorded talk
Ideally, the pre-recorded talks for the contributions should show the slides and the speaker, as you see it in a Zoom meeting. Therefore, if you can use zoom to do the pre-recording it would be easiest. For help see section "Record a talk."

These materials will be available to all participants via the conference archive throughout the conference. Contributions can be featured either in one of the discussion sessions or in the presenter forum where any of these materials may be shown or discussed. The executive summary might well be the first a participant might read when visiting your contribution. Also in the discussion sessions or the presenter forum, where contributions need to be briefly introduced, the executive summary will be very useful. As the discussions around contributions are unpredictable, you can have some back-up slides with extra plots or materials to be shown if and when needed. To present them quickly is perhaps easier when they are sitting on the conference archive, too. For this we provide the possibility for additional optional uploads.

Discussion Session

What exactly are the discussions sessions for?

The parallel sessions are largely discussion sessions around interesting topics (e.g. photo detectors, particle acceleration in AGN jets, TeV GRBs, …). The selection of topics will be done by the International Scientific Program Committee on the basis of the incoming abstracts.

  • 5x parallel 12 time slots = 60 sessions of 90 min each
  • For each discussion session there will be  conveners / discussion leaders
  • The conveners picks from the contributions those that relate to the topic.
  • The contributions for a session are listed before in the program, so that everybody can see its content.
  • Besides the conveners, the following persons should ideally be present in the session:
    • The speakers of the selected contributions
    • those who asked questions or commented on the selected contributions in the chat tool.
    • those who are interested in the topic of the discussion
  • Participants in the discussion session should ideally have looked at the contributions and the corresponding chats before the session.
  • During the discussion session, each of these contributions are briefly introduced (not more than a minute)
  • If the discussion stalls, some time could be used to actually give presentations of selected contributions (talks and poster flash talks).

Scheduling of Contributions
There are no sessions where all those contributions are scheduled one after the other, or are to be viewed at the same time in the same virtual room. Everyone is free to see any talk at any time and comment and ask questions via the chat tool. Questions and comments should be addressed by the author within a day.


There are two parts to the exhibition: The Industry Fair and the Science Fair.

More information here.


Price for Attending (per person)


Price for Attending (per person) after 1. July 2021


Price for each contribution


For undergrads and young scientists discounts are available.

    See below     

Regular registration ends on 30 June. Beyond that date late registration fee 200 € applies and no discounts are given any more. Registration will close on 10 July.

Fee reduction for Young scientists & Undergraduate students

Deadline 30 June 2021. From 1 July on we can't offer a reduced fee.

We offered a limited number of discounted rates for young scientists with accepted contributions from developing countries. Young scientists are Phd students or postdocs on their first contract.

For undergraduate students (master, bachelor, NO Phd students) we offer free participation in all parts of the conference.

Please send :

  • a scan of your valid student card (with photo)
  • your program of study and semester (preferably in english)
  • a document that shows your current enrollment status (in english)

to (with e-mail subject: "free undergraduate access") before you make your payment. Please wait until you have confirmation by our team before proceeding with the registration process. We can´t reimburse the fee for a regular registration to undergraduate students, because of administrative efforts. Please make sure you apply BEFORE you make the payment.


Materials are all datasets belonging to a contribution or plenary presentation: abstracts, slides, pre-recorded talks, posters, proceedings articles, questions and answers in the comments. During the conference, you will find all materials on the event platform.  Access will be opened a week before the official start of the conference only for registered participants. All materials remain accessible after the conference.

The upload of the conference materials to our conference system (VIMP) opens on 1 July. Deadline is - prolonged - until 7 July 2021. You will be notified and get further info by e-mail.  Note:  Without uploaded materials in time, the convener can’t prepare the discussion session with your contribution.
Templates for ppt, ZOOM backrounds, Logos and more can be downloaded here.

The upload of your proceedings article to the PoS website is initiated by a separate e-mail from PoS System with further info.
Templates can be downloaded here.

Outreach & Education

For the first time, the ICRC has inivited explicitly contributions on Outreach & Education in Astroparticle Physics. Communicating scientific issues to the public has become an essential part of research. As current developments show, this is an important bridge to society showing the value of science.

Plenary talks

Plenary talks are Invited Reviews, Highlight Talks and Rapporteur Talks. Highlight talks were already selected by the International Scientific Program Committee (ISPC). More information see here.

  • Talks will be live streamed and recorded live during the official event. These recordings will remain accessible after the conference.
  • Deadline for Proceedings submission is 15 September 2021.
Poster Contributions

Contributions fitting to the topic of one of the ~60 discussion sessions are scheduled for open discussion, where the presenter should attend.  

Contributions without a presentation in one of the discussion sessions will have the possibility to present their work at the Presenter Forum - an online poster session.

The preliminary timetable will be available in June.


  • a one-page classical poster, 16:9 landscape (.pdf) (16:9 for a better view on the screen)
  • a 2-min pre-recorded flash talk (.mp4 file)
  • the slides for the flash talk (.pdf)
  • a one page executive summary (.pdf)
  • an up to 8-page proceedings article (.pdf upload to the proceedings page)

Posters are typically A0 or A1 format, but as the posters in this conference are viewed on screens and not pinned up against poster walls, this is up to you. A large poster can contain more information, but requires then more zooming in and out to read all details. Best to make a poster that you can afterwards print out for our office walls. Posters in portrait mode do not match well the landscape computer screens. That is why we recommend landscape format.

Presenter Forum

All contributions (talks and posters) are available to participants from the conference archive throughout and after the conference. To each contribution questions and comments can be posed via a chat tool. The presenters are supposed to answer the chat entries of their contributions within a day.

Some contribution will get exposure during the scheduled parallel discussion sessions on physics topics.

All other contributions will be scheduled for small-group discussions with the presenter and interested participants during the "Presenter Forum”.

The two time slots are Fri 16 Jul, 18:00-20:00  and Mon 19 Jul, 12:00-14:00 (Berlin time). Presenters are expected to be online, in both sessions, and ready to discuss their contributions, in order to be reachable for participants from all time zones.


We use the remo tool (https://remo.co for that. Each contribution will be assigned a virtual “table" for up to 8 visitors (in a meeting “room", on a “floor", in a “building”) with a whiteboard where posters, slides and papers can be shown and discussed.

Also, scheduled contacts of participants will be available to stands of the Industry and Science Fairs are available.


For more information see here.
All proceedings article will be accessable here:

Recording a talk

Here is some guidance on how to pre-record your talks for the ICRC using commonly available tools.

Ideally, use a microphone close to your mouth. This is usually producing a much better quality than a built-in microphone of a laptop with noisy ventilators and key strokes.
In the end check that you stay within the allocated time (12-min or 2-min) and size (2 GB) and that your voice is loud and clear. Repeat the recording, if the result is not sufficient.


With Zoom this is straight forward. Get a free version of Zoom, open a meeting. Share your screen with the presentation, and chose a display option showing the slides and the speaker. Press the record button and start. After ending the Zoom session an .mp4 file is created. Check that you do not run over time and the sound is loud and clear. Upload only good quality recordings.






Prepare videos for upload

Please check the size of your recording. With Zoom, recordings are typically no more than about 5 MB per minute of recording. If you recording is much larger than that,  you may want to reduce the size of the videos before uploading them to keep the amount of data created when producing videos for upload reasonably small. This guides shows how to do this.



Registration is open:
After completing the registration you will automatically get an invoice for the payment (CreditCard, paypal).

Registration will close on 10 July 2021.

  • Cosmic Ray Physics
  • Gamma Ray Astronomy
  • Neutrino Astronomy & Physics
  • Dark Matter Physics
  • Solar & Heliospheric Physics
  • NEW Multi-Messenger Astronomy
    connects the classical topics, exploits their combination.
  • NEW Outreach & Education
    a small fringe meeting on methods, activities in O & E.
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