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"7 results found.
- Konus-Wind detection of GRB 241107A (short/hard)
- GRB 241107A: GROWTH-India telescope optical upper limit
- GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
- GRB 241107A: INTEGRAL IBIS localization
- IPN triangulation of GRB 241107A (short/hard)
- GRB 241107A: INTEGRAL/IBIS/PICsIT detection of a short burst
- GRB 241107A: SVOM/GRM detection of a short burst