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"8 results found.
- Radio observation of GRB 081109 with ATCA
- GRB 081109: TAROT La Silla observatory optical observations
- GRB 081109: GROND redshift limit and host extinction
- GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
- GRB 081109: Fermi GBM detection
- GRB 081109: Swift/UVOT upper limits
- GRB 081109: REM NIR afterglow detection
- GRB 081109: Swift detection of a burst