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 220708B: GIT optical upper limits
- GRB 220708B: T193-OHP optical upper limit
- Konus-Wind detection of GRB 220708B (Correction to GCN 32358)
- Konus-Wind detection of GRB 220708B
- GRB 220708B: CALET Gamma-Ray Burst Monitor detection
- GRB 220708B: Nanshan/NEXT optical upper limits
- GRB 220708B: Swift-XRT afterglow detection
- GRB 220708B: Swift ToO observations
- GRB 220708B: Swift/BAT-GUANO arcminute localization