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"12 results found.
- GRB 250313A: GRBAlpha detection
- GRB 250313A: Fermi GBM Detection
- GRB 250313A: CALET Gamma-Ray Burst Monitor detection
- GRB 250313A: Swift-XRT observations
- Konus-Wind detection of GRB 250313A
- GRB 250313A: SVOM/GRM observation of a bright long burst
- GRB 250313A: AstroSat CZTI detection of a bright long burst
- GRB 250313A: Fermi-LAT detection
- GRB 250313A: Swift ToO observations
- Fermi GRB 250313A: Global MASTER-Net observations report
- GRB 250313A???: BALROG localization (Fermi Trigger / GRB 250313607)
- GRB 250313A: Fermi GBM Final Real-time Localization