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"13 results found.
- GRB 170607A: 15 GHz upper limits from AMI
- GRB 170607A CALET Gamma-Ray Burst Monitor detection
- GRB 170607A: Redshift from GTC/OSIRIS
- GRB 170607A: ISON/Terskol optical observations
- GRB 170607A: Swift-BAT refined analysis
- GRB 170607A: Correction on the possible host galaxy identification
- GRB 170607A: Swift/UVOT Detection
- GRB 170607A: MASTER-Tavrida early OT observations
- GRB 170607A: Fermi GBM observation
- GRB 170607A: NOT optical afterglow detection
- GRB 170607A: Swift-XRT refined Analysis
- GRB 170607A: Enhanced Swift-XRT position
- GRB 170607A: Swift detection of a burst with a bright optical counterpart