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"12 results found.
- Konus-Wind observation of GRB 190324A
- GRB 190324A: Swift/UVOT Observations
- GRB 190324A: Insight-HXMT/HE detection
- GRB 190324A: Swift-BAT refined analysis
- GRB 190324A: CALET Gamma-Ray Burst Monitor detection
- GRB 190324A: Swift-XRT refined Analysis
- GRB 190324A: Fermi GBM observation
- GRB 190324A: Enhanced Swift-XRT position
- GRB 190324A: VLT/X-shooter redshift
- GRB 190324A: Swift-XRT observations
- GRB 190324A: Swift/UVOT afterglow candidate
- GRB 190324A: Swift detection of a burst