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 191004B: Swift/UVOT Detection
- GRB 191004B: Continued Optical Afterglow Monitoring with LCO
- GRB 191004B: Correction to Konus-Wind GCN 25974
- Konus-Wind observation of GRB 191004B
- GRB 191004B: Swift-XRT refined Analysis
- GRB 191004B: GROND Detection of the Optical/NIR Afterglow
- GRB 191004B: COATLI Optical Observations
- GRB 191004B: VLT/X-shooter redshift
- GRB 191004B: Swift-BAT refined analysis
- GRB 191004B: NOT optical photometry
- GRB 191004B: Enhanced Swift-XRT position
- GRB 191004B: Optical Afterglow Detection with LCO
- GRB 191004B: Swift detection of a burst with an optical counterpart