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"11 results found.
- GRB 210807A: continued Assy, AbAO and Mondy observations
- GRB 210807A: Tautenburg observations
- GRB 210807A: Detection by GRBAlpha
- GRB 210807A: Swift-BAT refined analysis
- GRB 210807A: Swift/UVOT Detection
- GRB 210807A: Swift-XRT refined Analysis
- GRB 210807A: correction to the GCN Circ. #30614 Assy optical observations
- Swift GRB 210807A: Global MASTER-Net observations report
- GRB 210807A: Enhanced Swift-XRT position
- GRB 210807A: BOOTES-5/JGT optical afterglow detection
- GRB 210807A: Swift detection of a burst with an optical counterpart