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"13 results found.
- GRB 260208B: refined analysis of the EP-FXT observation
- GRB 260208B: AstroSat CZTI detection of a bright long burst
- GRB 260208B: Swift-XRT observations
- GRB 260208B: COLIBRÍ optical observations
- GRB 260208B: EP-FXT observation
- GRB 260208B: SVOM/VT optical candidate
- GRB 260208B: Swift ToO observations
- GRB 260208B: SVOM/GRM observation of a bright burst
- GRB 260208B: Fermi GBM Detection
- LAT GRB 260208B: Global MASTER-Net observations report
- GRB 260208B: Fermi-LAT detection
- GRB 260208B: BALROG localization (Fermi Trigger 792237169 / GRB 260208412)
- GRB 260208B: Fermi GBM Final Real-time Localization