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"9 results found.
- IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
- GRB100909A: MITSuME Ishigakijima Optical upper limits
- GRB 100909A: Swift/UVOT observations
- GRB 100909A: Swift-XRT refined analysis
- GRB 100909A: Faulkes Telescope North afterglow candidate
- GRB 100909A: ROTSE-III Optical Limits
- GRB 100909A: Planned XMM-Newton observation
- GRB 100909A: Swift target of opportunity observation
- GRB 100909A: a long GRB detected by INTEGRAL