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 251005C: PRIME J-band upper limit
- GRB 251005C: SVOM/VT optical fading
- GRB 251005C: SVOM/GRM observation of a likely short GRB
- GRB 251005C: COLIBRÍ optical observations
- GRB 251005C: VLT/X-shooter Imaging
- GRB 251005C: SVOM/VT optical candidate
- GRB 251005C: AstroSat CZTI detection
- GRB 251005C: Swift/UVOT Upper Limits
- GRB 251005C: Swift-XRT refined Analysis
- GRB 251005C: Fermi GBM Observation
- GRB 251005C: Enhanced Swift-XRT position
- GRB 251005C: GOTO optical upper limits
- GRB 251005C: Swift detection of a burst