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"11 results found.
- GRB 241113B : RAPAS follow-up observation
- GRB 241113B: EP-FXT afterglow detection
- GRB 241113B: SVOM/VT optical afterglow observations
- GRB 241113B: Mephisto upper limits
- GRB 241113B: KAIT Optical Afterglow Candidate
- GRB 241113B: J-band upper limit from WINTER
- GRB 241113B: Swift-XRT observations
- EP241113b/GRB 241113B: EP detection of GRB 241113B
- GRB 241113B: SVOM/GRM observation
- GRB 241113B: Swift ToO observations
- GRB 241113B : detection of a long GRB by SVOM/ECLAIRs