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.
- BepiColombo MGNS joins the IPN
- GRB 200219C: VLA Detection
- Konus-Wind observation of GRB 200219C
- GRB 200219C: Swift-XRT afterglow confirmation
- GRB 200219C: OAJ afterglow confirmation
- GRB 200219C: CALET Gamma-Ray Burst Monitor detection
- GRB 200219C: Nanshan/NEXT optical upper limit and possible host galaxy from PanSTARRS
- GRB 200219C: Swift-XRT afterglow detection
- GRB 200219C: DDOTI Observations
- GRB 200219C: Fermi GBM detection
- GRB 200219C: Tiled Swift observations
- GRB 200219C: Fermi-LAT detection
- GRB 200219C: Fermi GBM Final Real-time Localization