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"16 results found.
- GRB 200306C: ALMA 3mm upper limit
- GRB 200306C: Swift-BAT refined analysis
- GRB 200306C: Swift/UVOT Detection
- GRB 200306C: Calar Alto 2.2m upper limit
- GRB 200306C: Swift-XRT refined Analysis
- GRB 200306C: Enhanced Swift-XRT position
- GRB 200306C: VIRT optical upper limits
- GRB 200306C: KCT upper limit of the optical afterglow
- GRB 200306C: LCO Optical Upper Limits
- GRB 200306C: OSN 1.5m afterglow detection
- GRB 200306C: Liverpool Telescope observations
- GRB 200306C: SAO RAS observations of OT
- GRB 200306C: GOTO upper limits
- GRB 200306C: BOOTES-1 detection of the optical afterglow
- GRB 200306C: FRAM-ORM afterglow detection
- GRB 200306C: Swift detection of a burst with an optical counterpart