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.
- GRB 240916A: radio detection with the VLA
- GRB 240916A: GRBAlpha detection
- GRB 240916A: NOT optical observation
- GRB 240916A: Fermi GBM Observation
- GRB 240916A (AT 2024vlp / GOTO24fzn): VLT/X-shooter redshift
- GRB 240916A: Swift-XRT afterglow detection
- GRB 240916A: Swift ToO observations
- GRB 240916A: JinShan optical decay in one of the two GOTO candidates
- GRB 240916A: GOTO identification of two new optical sources within the GBM localisation region
- GRB 240916A INTEGRAL SPI ACS LIGHT CURVE
- GRB 240916A: Fermi GBM Final Real-time Localization