Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

SuperNova Early Warning System (SNEWS)

SNEWS logo

Start: 2004

Data Archives: GCN Classic

SNEWS is a consortium of MeV neutrino facilities which work together to distribute early warning alerts for core-collapse supernovae, reporting the neutrinos released during the collapse event before the first light of the supernova escapes.

Super-KamikandeWater Cherenkov detectors
IceCubeWater Cherenkov detectors
KM3NetWater Cherenkov detectors
KamLANDPure liquid scintillators
SNO+Pure liquid scintillators
NOvAPure liquid scintillators
HALOLead-based detection
XENONntLiquid noble dark matter detectors
LZLiquid noble dark matter detectors
PANDAX-4TLiquid noble dark matter detectors

GCN Notice Types in GCN Classic and GCN Classic Over Kafka: Detailed Descriptions and Examples

SNEWSREAL or TEST supernova alertMinutes

Yearly Event Rates:

SNEWSCore-collapse supernova0.035–360°
Test alert525–360°
Looking for U.S. government information and services? Visit