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"14 results found.
- GRB 090516: Fermi GBM observation
- GRB 090516: Observations from Stardome Observatory
- GRB 090516, RIMOTS optical upper limits
- GRB 090516: Swift-BAT refined analysis
- GRB 090516: VLT spectrum (correction & update)
- GRB 090516: GROND OBSERVATIONS
- GRB 090516: VLT redshift
- GRB 090516 - Zadko Telescope observations
- GRB 090516: NOT optical observations
- GRB 090516: Swift XRT refined analysis
- GRB 090516: Swift/UVOT Observations
- GRB 090516: Enhanced Swift-XRT position
- GRB 090516: Faulkes Telescope South optical afterglow
- GRB 090516: Swift detection of a burst