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.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"13 results found.
- GRB 130216A: Swift/UVOT Upper Limit
- GRB 130216A: possible radio counterpart is steady field source
- GRB 130216A: Swift/XRT observations
- GRB 130216A: Further Swift-BAT refined analysis
- GRB 130216A: MASTER-Net early observations
- GRB 130216A: Fermi GBM observation
- GRB 130216A: possible early detection at 15 GHz
- GRB 130216A: MITSuME Ishigakijima upper limits
- GRB 130216A: P200 NIR Observations
- GRB 130216A: Swift-BAT refined analysis
- GRB 130216A: TAROT La Silla observatory optical observations
- GRB 130216A: OSN I-band observations
- GRB 130216A: Swift detection of a burst