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"13 results found.
- GRB 241229B: Continued CrAO ZTSh observations
- GRB 241229B: SVOM/GRM observation
- GRB 241229B: SAO RAS optical upper limit
- GRB 241229B: CrAO ZTSh possible optical counterpart of SVOM/VT confirmation
- GRB 241229B: SVOM/VT optical candidate
- GRB 241229B: Swift-BAT refined analysis
- GRB241229B: UVOT upper limits
- GRB 241229B: Fermi GBM Observation
- GRB 241229B: NUTTelA-TAO / BSTI Optical Limits
- GRB 241229B: Swift-XRT refined Analysis
- Swift GRB 241229B: Global MASTER-Net observations report
- GRB 241229B: Swift detection of a burst
- GRB 241229B: Fermi GBM Final Real-time Localization