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 150821A: Flattening in the UVOT light curve
- Konus-Wind observation of GRB 150821A
- GRB 150821A: LCOGT Siding Springs early observations
- GRB 150821A: LCOGT Sutherland observations
- GRB 150821A, Swift-BAT refined analysis
- GRB 150821A: GROND afterglow observations
- GRB 150821A: Swift-XRT refined Analysis
- GRB 150821A: Swift/UVOT Detection
- GRB 150821A: Enhanced Swift-XRT position
- GRB 150821A: Fermi GBM detection
- GRB 150821A: VLT/X-shooter redshift
- GRB 150821A: Swift detection of a burst with an optical afterglow