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"15 results found.
- GRB 160227A: MAXI/GSC detection
- GRB 160227A: LOAO 1.0m optical detection
- GRB 160227A: McDonald 0.8m Detection
- GRB 160227A: Swift/UVOT Detection
- GRB 160227A: MASTER prompt OT Detection and LC
- GRB 160227A: AROMA-N Optical Observation
- GRB 160227A: NOT redshift
- GRB 160227A, Swift-BAT refined analysis
- GRB 160227A: Swift-XRT refined Analysis
- GRB 160227A: Enhanced Swift-XRT position
- GRB 160227A: MAXI/GSC detection
- GRB 160227A: ISON-Kislovodsk optical observation
- GRB 160227A: Mt. Terskol observatory optical observation
- GRB 160227A: MASTER OT Detection
- GRB 160227A: Swift detection of a burst with an optical counterpart