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"10 results found.
- GRB 190919B: BOOTES-5/JGT and BOOTES-3/YA optical observations
- GRB 190919B: LCO Optical Afterglow Detection
- GRB 190919B: Swift/UVOT Upper Limits
- GRB 190919B: FRAM-Auger optical detection
- GRB 190919B: Swift-XRT observations
- GRB 190919B: VLT/X-shooter redshift
- GRB 190919B: MASTER OT early detection at GROND position
- GRB 190919B: Swift ToO observations
- GRB 190919B: GROND detection of the NIR afterglow
- GRB 190919B: A long GRB detected by INTEGRAL