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"13 results found.
- GRB 200224A: Mondy optical upper limit
- GRB 200224A: Calar Alto 2.2m optical afterglow detection
- GRB 200224A: Swift-BAT refined analysis
- GRB 200224A: LCO Upper Limits
- GRB 200224A: RATIR Optical Observations and Confirmation of the Afterglow
- GRB 200224A: Swift/UVOT Detection
- Correction in name: GRB 200224B and GRB 200224C (not GRB 200224A)
- GRB 200224A: Swift-XRT refined Analysis
- GRB 200224C: Fermi GBM Final Real-time Localization
- GRB 200224A: Tautenburg observations
- GRB 200224A: BOOTES-1 and 1.5m OSN optical observations
- GRB 200224B: Fermi GBM Final Real-time Localization
- GRB 200224A: Swift detection of a burst