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"18 results found.
- GRB 160117B: RATIR continued observations
- GRB 160117B: TNG spectroscopy and redshift confirmation
- GRB 160117B: VLA Detection
- GRB 160117B: further RATIR observations
- GRB 160117B: RATIR Optical and NIR Observations
- GRB 160117B: further NOT optical observations of the afterglow
- GRB 160117B: Early iTelescope observation
- GRB 160117B: GROND optical/NIR afterglow observations
- GRB 160117B: VLT/X-shooter spectroscopy
- GRB 160117B: iTelescope T17 optical observations
- GRB 160117B: NOT optical afterglow observations
- GRB 160117B: Swift-XRT refined Analysis
- GRB 160117A: Swift-BAT refined analysis
- GRB 160117B: Swift/UVOT Detection
- GRB 160117B: Enhanced Swift-XRT position
- GRB 160117B: LCOGT-SSO optical observations
- GRB 160117B: MASTER-Amur OT observations
- GRB 160117B: Swift detection of a burst with optical counterpart