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 111016A: optical upper limit
- GRB111016A : WIYN 3.5m NIR observations
- GRB111016A: D50 optical limit
- GRB 111016A: Gemini Detection of the NIR Counterpart
- GRB 111016A: Swift/UVOT Detection of a Source
- GRB 111016A: Swift-BAT refined analysis
- GRB 111016A: P60 Afterglow Candidate
- GRB 111016A: MITSuME Akeno Optical upper limits
- GRB 111016A: Swift-XRT refined Analysis
- GRB 111016A: Enhanced Swift-XRT position
- GRB 111016A: Swift-XRT observations
- GRB 111016A: Swift detection of a burst