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"12316 results found.
- GRB980613, optical observations
- SGR1627-41, RXTE/ASM observations
- GRB 980613: Detection of the probable host galaxy
- GRB 980613 Optical Observations
- GRB 980613 optical observations
- GRB 980519 Optical Observations
- GRB980519 optical observations
- BSAX Observations of GRB980425 field
- report on BSAX observations of GRB980425
- GRB 980329 ROSAT observation
- GRB980326 X-ray Observations
- GRB980326, optical observations
- GRB980329, Fading IR counterpart to radio source
- Optical Observations on GRB 971227
- GRB 971227: Optical observations
- GRB 971214: EUVE Observations