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 201104B: Maidanak and CrAO optical observations
- GRB 201104B: continued TSHAO optical observation
- GRB 201104B: MITSuME Akeno optical observation
- GRB 201104B: 1.3m DFOT optical observations
- GRB 201104B: Kitab optical observations
- GRB 201104B: TSHAO optical observation
- GRB 201104B: Swift/UVOT Detection
- GRB 201104B: Swift-XRT refined Analysis
- GRB 201104B: VLT/X-shooter redshift
- GRB 201104B: Swift-BAT refined analysis
- GRB 201104B: Swift/UVOT Detection
- GRB 201104B: MASTER optical observation
- GRB 201104B: Swift detection of a burst