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"11 results found.
- Konus-Wind detection of GRB 240905B
- GRB 240905B: VZLUSAT-2 detection
- IPN triangulation of GRB 240905B (short)
- GRB 240905B: Fermi GBM Observation
- GRB 240905B: GOTO optical upper limits
- GRB 240905B: Swift-XRT observations
- GRB 240905B: Fermi-LAT detection
- GRB 240905B: Swift ToO observations
- Fermi GRB 240905B: Global MASTER-Net observations report
- GRB 240905B: AstroSat CZTI detection and localization
- GRB 240905B: Fermi GBM Final Real-time Localization