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"27811 results found.
- BSAX Observations of GRB980425 field
- GRB 980329 ROSAT observation
- GRB980326, optical observations
- GRB980329
- GRB980329 Keck K-band observations
- GRB980329 optical observations
- Optical Observations of the GRB 971227 field
- GRB971227: Further CAHA R-band images
- GRB 971227: CAHA R-band images
- GRB 971214: Redshift from Keck Optical Observations
- GRB 971214: KPNO Optical Observations