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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"14 results found.
- GRB 060323 : WIDGET simultaneous optical observations
- GRB 060323: Early optical observation at Xinglong
- GRB060323: NOT optical observations
- GRB 060323: Swift/UVOT Observations
- GRB 060323: optical afterglow confirmed
- GRB060323: NOT observations
- GRB 060323: Optical Observations
- GRB 060323: Tautenburg OT candidate retraction
- GRB 060323: Refined analysis of the Swift-BAT burst
- GRB 060323: optical observations at TNG
- GRB 060323: Swift XRT refined analysis
- GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
- GRB 060323: Swift/XRT position
- GRB 060323: Swift detection of a burst with a possible optical afterglow