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"16 results found.
- GRB190311A: MITSuME Akeno optical observation
- GRB 190311A: OSN optical afterglow detection
- GRB 190311A: Swift/UVOT Detection
- GRB 190311A: Mondy optical observations
- GRB 190311A: Liverpool Telescope observations
- GRB 190311A: NOT optical counterpart
- GRB 190311A: Swift-BAT refined analysis
- GRB 190311A: Mondy optical observations
- GRB 190311A: GMG observation
- GRB 190311A: Fermi GBM observation
- GRB 190311A: Swift-XRT refined Analysis
- GRB 190311A: TSHAO optical observations
- GRB 190311A: Enhanced Swift-XRT position
- GRB 190311A: NEXT-0.6m optical afterglow detection
- GRB 190311A: Mondy optical observations
- GRB 190311A: Swift detection of a burst with optical counterpart