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 191016A: REM optical observations
- GRB 191016A: Swift-XRT afterglow detection
- GRB 191016A: Swift/UVOT Detection
- GRB191016A: MITSuME Okayama optical observation
- GRB 191016A: AZT-20 (Assy observatory) optical photometry
- GRB 191016A: early time BOOTES Network and follow-up 1.5m OSN optical observations
- GRB 191016A: RATIR Optical and NIR Observations
- GRB 191016A: Optical limit by Ondrejov D50
- GRB 191016A: Swift-BAT refined analysis
- GRB 191016A: KAIT Optical Afterglow Confirmation
- GRB 191016A: COATLI Optical Observations and Detection of the Afterglow
- GRB 191016A: Swift detection of a burst