GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"7 results found.
- GRB 230707B: Fermi GBM Observation
- GRB 230707B: CALET Gamma-Ray Burst Monitor detection
- Fermi-LAT gamma-ray observations of IceCube-230707B
- IceCube-230707B: Upper limits from a search for additional neutrino events in IceCube
- GRB 230707B: Swift/BAT-GUANO detection of a burst outside the coded FOV
- IceCube-230707B - IceCube observation of a high-energy neutrino candidate track-like event
- GRB 230707B: Fermi GBM Final Real-time Localization