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 201116A: CALET Gamma-Ray Burst Monitor detection
- Konus-Wind detection of GRB 201116A
- GRB 201116A: NOT optical observations
- GRB 201116A: Swift-XRT afterglow detection
- GRB 201116A: OSN Afterglow Candidate
- GRB 201116A: Fermi-LAT detection
- GRB 201116A: Tiled Swift observations
- GRB 201116A: BALROG localization (Fermi Trigger 627180592 / GRB 201116035)
- GRB 201116A: Fermi GBM Final Real-time Localization