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"15 results found.
- EP251129a/GRB 251129A: EP-FXT follow-up observations
- GRB 251129A / EP251129a: GTC/OSIRIS+ spectroscopic redshift z = 1.460
- GRB 251129A / EP251129a: OSN and CAHA optical follow-up
- GRB 251129A / EP251129a: SAO RAS optical observations
- SVOM GRB 251129A : MASTER optical counterpart detection
- GRB 251129A: Swift-XRT afterglow detection
- GRB 251129A: Swift ToO observations
- GRB 251129A: SVOM/VT optical fading
- GRB 251129A: Optical Observations via Virtual Telescope Project, Italy
- EP251129a/GRB 251129A : Einstein Probe detection of an X-ray transient
- GRB 251129A: Correction to the position of the optical counterpar
- GRB 251129A: SVOM/VT optical counterpart confirmation with VHF data
- GRB 251129A: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
- GRB 251129A: SVOM detection of a burst
- GRB 251129A: SVOM detection of a burst