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"14 results found.
- GRB 150424A: HST imaging
- GRB 150424A: 9.8 GHz VLA detection
- GRB 150424A: RATIR Observations
- GRB 150424A: Swift-BAT refined analysis
- GRB 150424A: Swift-XRT refined Analysis
- GRB 150424A: spectral lag, extended-time emission
- GRB 150424A: 10.4m GTC spectroscopy
- GRB 150424A: GROND detects strong fading
- GRB 150424A: NOT optical observations
- Konus-Wind observation of GRB 150424A
- GRB 150424A: Swift/UVOT Observations
- GRB 150424A: Enhanced Swift-XRT position
- GRB 150424A: Keck detection of optical afterglow
- GRB 150424A: Swift detection of a short burst