The GCN Team is pleased to announce new features on https://gcn.nasa.gov. SVOM VOEvent Notices Available Over Kafka The SVOM Team and the GCN team are pleased to announce the availability of SVOM notice types via the new GCN in VOEvent format. These notices can be streamed via Kafka. They are not available via GCN Classic. The SVOM Team plans to add JSON format notices at a later date. SVOM Mission Summary: The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a French-Chinese mission, result of a collaboration between the two national space agencies, China National Space Administration (CNSA) and Centre national d'études spatiales (CNES). SVOM mission is dedicated to the study of the most powerful transient phenomena, with a particular emphasis on gamma-ray bursts (GRBs). The SVOM spacecraft carries four multi-wavelength instruments: ECLAIRs, Gamma Ray burst Monitor (GRM), Microchannel X-ray Telescope (MXT) and Visual Telescope (VT). Notice topics: new SVOM notices provide GRB detection and follow-up observation details. Each of the four instruments has its own dedicated topic to stream notices with their related information, see table below: - gcn.notices.svom.voevent.grm - gcn.notices.svom.voevent.eclairs - gcn.notices.svom.voevent.mxt - gcn.notices.svom.voevent.vt A more extensive description of the information provided in these new notices is available at https://gcn.nasa.gov/missions/svom. Planned Retirement of GCN Classic VOEvent Brokers The result of the November 2024 user survey of those utilizing the GCN VOEvent Brokers to receive VOEvent-format Notices with the VOEvent Transport Protocol is overwhelmingly in favor of retiring the brokers and users migrating to receive VOEvent Notices over Kafka. This service is already available for all GCN Classic Notice types with self-subscription via the Start Streaming Notices Guide. The GCN Classic VOEvent brokers will be retired shortly after the conclusion of the O4 gravitational wave network observing run, currently scheduled for October 7, 2025. We recommend the following actions for users currently utilizing VOEvent via GCN Classic. - Sign up to receive VOEvent format Notices via Kafka or email - Let the GCN Team know when you're ready to unsubscribe from receiving them via the GCN Classic brokers. All GCN Classic VOEvent subscribers will be unsubscribed after the end of O4 and the brokers will be taken offline. For more details on this new feature and an archive of GCN news and announcements, see https://gcn.nasa.gov/news. For questions, issues, or bug reports, please contact us via: - Contact form: https://gcn.nasa.gov/contact - GitHub issue tracker: https://github.com/nasa-gcn/gcn.nasa.gov/issues --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...