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"14 results found.
- GRB 220430A: Nanshan/NEXT optical upper limit
- GRB 220430A: Nanshan/HMT optical upper limit
- GRB 220430A: GIT optical upper limits
- GRB 220430A: AstroSat CZTI detection
- GRB 220430A: Swift-BAT refined analysis
- GRB 220430A: CAHA 2.2m telescope optical limit
- GRB 220430A: Swift-XRT refined Analysis
- Swift GRB 220430A: Global MASTER-Net observations report
- GRB 220430A: GRANDMA observations
- GRB 220430A: Mondy and AbAO optical upper limits
- GRB 220430A: AGILE detection
- GRB 220430A: MeerLICHT optical upper limits
- GRB 220430A: Enhanced Swift-XRT position
- GRB 220430A: Swift detection of a burst or Swift J0630.4+0932