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 210731A: continued GROND observations
- GRB 210731A: VLT/X-shooter redshift
- GRB 210731A: KAIT Optical Detection
- GRB 210731A: Swift-BAT refined analysis
- GRB 210731A: MASTER optical afterglow detection
- GRB 210731A: Swift-XRT refined Analysis
- GRB 210731A: GROND observations
- GRB 210731A: Fermi GBM Observation
- GRB 210731A: Swift/UVOT Detection of an optical afterglow
- GRB 210731A: MeerLICHT optical afterglow detection
- GRB 210731A: Swift detection of a burst