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"16 results found.
- GRB 251022A: Swift-XRT confirmation of fading
- Konus-Wind detection of GRB 251022A
- GRB 251022A: SVOM/GRM observation
- GRB 251022A: KAIT optical observations
- GRB 251022A: COLIBRÍ Further Multi-frequency Optical Observations
- GRB 251022A: Swift-XRT detection of GOTO25iym
- GRB 251022A: GROWTH-India Telescope optical observations
- GRB 251022A: Fermi GBM Observation
- GRB 251022A: Swift/BAT-GUANO localization skymap of a burst
- GRB 251022A: COLIBRÍ optical observations
- GRB 251022A: MASTER OT detection
- GRB 251022A: DDOTI Optical Detection
- GRB 251022A: GOTO optical counterpart detection
- GRB 251022A: Fermi-LAT detection
- GRB 251022A: Tiled Swift observations
- GRB 251022A: Fermi GBM Final Real-time Localization