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"16 results found.
- GRB 161214B: 15 GHz upper limits from AMI
- GRB 161214B: MASTER-Kislovodsk early optical observations
- GRB 161214B: optical spectroscopy of the foreground SDSS object
- GRB 161214B: AbAO and ISON/Terskol optical observations
- GRB 161214B: Mondy optical observations
- GRB 161214B: Swift-BAT refined analysis
- GRB 161214B: Swift/UVOT Afterglow Confirmation
- GRB 161214B: RATIR Optical and Near-Infrared Observations
- GRB 161214B: Swift-XRT refined Analysis
- GRB 161214B: Enhanced Swift-XRT position
- GRB 161214B: TAROT Calern observatory optical observations
- GRB 161214B: Chante-perdrix observatory optical observations
- GRB 161214B: Swift/UVOT Observations
- GRB 161214B: NOT optical observations, possible counterpart
- GRB 161214B: Prompt enhanced Swift-XRT position
- GRB 161214B: Swift detection of a burst