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 120907A: optical observations of ISON-Kislovodsk
- GRB 120907A: SMA upper limits
- GRB 120907A: EVLA observations
- GRB 120907A: Swift/UVOT Detection
- GRB 120907A: Swift-XRT refined Analysis
- GRB 120907A: Spectroscopy from OSIRIS/GTC
- GRB 120907A: Enhanced Swift-XRT position
- GRB 120907A: Fermi GBM detection
- GRB 120907A: Swift-BAT refined analysis
- GRB 120907A: NOT optical observations
- GRB 120907A MASTER optical observations
- GRB 120907A: ROTSE-III Optical Limits
- GRB 120907A: Swift detection of a burst with optical counterpart