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 131231A: AAO optical observations
- GRB 131231A : Lulin Optical Observations
- GRB 131231A: CARMA 3mm detection
- GRB 131231A, Optical Observations
- GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
- GRB 131231A: Fermi GBM correction to GCN 15644
- Konus-Wind observation of GRB 131231A
- GRB 131231A: Gemini-South Redshift
- GRB 131231A: P60 observations
- GRB 131231A: Swift-XRT observations
- GRB 131231A : xinglong TNT optical observation
- GRB 131231A: MDM afterglow observation
- GRB 131231A: VLT/X-shooter redshift
- GRB 131231A: Fermi GBM detection
- GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
- GRB 131231A: afterglow confirmation from the NOT
- GRB 131231A: Nanshan afterglow candidate
- GRB 131231A: Fermi-LAT detection of a burst