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"11 results found.
- GRB 251118A: Swift/UVOT Detection
- GRB 251118A: Glowbug gamma-ray detection
- GRB 251118A: Fermi GBM Observation
- GRB 251118A: Swift-XRT afterglow detection
- GRB 251118A: GECAM-B detection
- GRB 251118A: NuSTAR detection of bright prompt emission
- GRB 251118C: Swift/BAT rates detection of a burst with a possible association with EP 251118A
- GRB 251118A: Fermi-LAT detection
- GRB 251118A: Swift ToO observations
- GRB 251118A: BALROG localization (Fermi Trigger 785190695 / GRB 251118855)
- GRB 251118A: Fermi GBM Final Real-time Localization