Dear all, This is the 4th circular of the 9th Asian Triangle Heavy-Ion Conference (ATHIC2023) held at the JMS Aster Plaza in Hiroshima on April 24-27, 2023. It has been decided that the conference will be held solely in person. We would appreciate your cooperation if you kindly respect our instructions during the conference, to follow the Japanese government policy etc. against COVID19 at the time of the conference. Let us remind you that both abstract submission and discounted early registration are available only till February 28. After the promotion ends, a raised registration fee (35,000 JPY) will be charged for all late participants including students. Please be sure to complete your registration with a full payment before the deadline even if you already have proceeded the registration process, but if not yet paid the registration fee. Otherwise you will be charged the raised registration fee. Other useful information can be found below. We look forward to seeing you in person at Hiroshima. The conference intends to discuss the recent progress on understanding of the topics relevant to the high-energy heavy-ion collisions from both experimental and theoretical points of view. Conference topics: - Initial state and thermal equilibrium - Jets and medium response - Heavy quarks and quarkonia - Electromagnetic probes - Collective dynamics - Correlations and fluctuations - QCD phase diagram and extreme states - QGP in small systems - Intense field and vorticity - Hadron interactions and exotics - New theoretical developments - Experimental techniques and future programs The conference indico page can be found at: https://indico.cern.ch/e/athic2023 <Registration> Registration page : https://indico.cern.ch/event/1176274/page/27803-registration Please follow the registration procedure below. ======== Registration procedure ======== The registration page can be found at: https://indico.cern.ch/event/1176274/page/27803-registration We have 2 separate registration forms for regular participants and students with a discounted fee at early registration until February 28, 2023. 1. Choose the correct form for you and fill in required fields. <Regular participants>: https://indico.cern.ch/event/1176274/registrations/84819/ <Students> : https://indico.cern.ch/event/1176274/registrations/89390/ 2. [Important] After submission of your registration request, you will receive a confirmation e-mail containing the instruction of your payment for a registration fee. 3. Your registration will be approved after completing your payment. If you have a question/problem on registration, please e-mail to LOC (athic23-loc@ml.hiroshima-u.ac.jp). <Important dates and abstract submission> Abstract submission: https://indico.cern.ch/event/1176274/abstracts/ Abstract submission open : November 1, 2022 Registration open : December 8, 2022 Deadline for abstract submission: February 28, 2023 Deadline for early registration : February 28, 2023 Deadline for late registration : April 10, 2023 <VISA information> Information about VISA requirements for travel to Japan can be found in the following web page: https://www.mofa.go.jp/j_info/visit/visa/index.html Citizens of China, India, and others may need a VISA. Please check the web page above. Letters of invitation for VISA purposes will be available upon request for registered conference participants. We recommend you to act well in advance. Please contact the LOC (athic23-loc@ml.hiroshima-u.ac.jp) along with completing your registration with a full payment. <Child-care service> Child-care service is available at the conference venue. Please check “Practical Information” in the conference web page: https://indico.cern.ch/event/1176274/page/27246-practical-information <Contact> athic23-loc@ml.hiroshima-u.ac.jp Best regards,ATHIC2023 LOC