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"9 results found.
- GRB 250905A: Swift-BAT refined analysis
- Fermi-LAT Gamma-ray Observations of IceCube-250905A
- IceCube-250905A: Upper limits from a search for additional neutrino events in IceCube
- GRB 250905A: Swift-XRT refined Analysis
- IceCube-250905A - IceCube observation of a high-energy neutrino candidate track-like event
- GRB 250905A: Swift/UVOT Upper Limits
- GRB 250905A: Enhanced Swift-XRT position
- GRB 250905A: KAIT optical upper limit
- GRB 250905A: Swift detection of a burst