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"14 results found.
- GRB 240828A: SVOM/GRM observation
- GRB 240828A: GECAM detection
- GRB 240828A: SAO RAS AS-500(2) optical observations
- GRB 240828A: KAIT continued optical observations
- GRB 240828A: SAO RAS optical observations
- GRB 240828A: Fermi GBM Observation
- GRB 240828A: KAIT Optical Afterglow Candidate
- GRB 240828A: Swift-XRT afterglow detection
- GRB 240828A: Fermi-LAT detection
- GRB 240828A: Tiled Swift observations
- GRB 240828A: AstroSat CZTI detection of a long burst
- Fermi GRB 240828A: Bassano Bresciano Observatory upper limit
- Fermi GRB 240828A: Global MASTER-Net observations report
- GRB 240828A: Fermi GBM Final Real-time Localization