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 210912A: LBT optical observations
- GRB 210912A: BOOTES-5/JGT optical afterglow candidate (Correction to GCNC 30823)
- GRB 210912A: Swift-BAT refined analysis
- GRB 210912A: Tautenburg observations
- GRB 210912A: CAHA 2.2m Detection
- GRB 210912A: Swift-XRT refined Analysis
- GRB 210912A: Swift/UVOT Detection
- GRB 210912A: Enhanced Swift-XRT position
- GRB 210912A: Host-galaxy candidate in PanSTARRS
- GRB 210912A: Mondy optical afterglow confirmation
- Swift GRB 210912A: Global MASTER-Net observations report
- GRB 210912A: BOOTES-5/JGT optical afterglow candidate
- GRB 210912A: Swift detection of a burst