GCN Circulars
GCN Circulars are rapid bulletins submitted by and distributed to the community. 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 250717B: SVOM/GRM observation
- GRB 250717B: COLIBRÍ optical upper limit
- GRB 250717B: Swift-XRT observations
- GRB 250717B: Swift ToO observations
- GRB 250717B: Fermi GBM Observation
- GRB 250717B: Swift/BAT-GUANO arcminute localization of a burst
- GRB 250717B: Fermi GBM Final Real-time Localization