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.
- GRB 120802A: optical observations in CrAO
- GRB 120802A: optical observations
- GRB 120802A: Swift/UVOT Upper Limits
- GRB 120802A: EVLA Observations
- GRB 120802A: GRT Optical Observation
- GRB 120802A: Swift-XRT refined Analysis
- GRB 120802A Gemini-N redshift
- GRB 120802A: APEX/LABOCA submm observations
- GRB 120802A: Swift-BAT refined analysis
- GRB 120802A: Enhanced Swift-XRT position
- GRB 120802A: MASTER optical observations
- GRB 120802A: optical uper limit in ISON-NM observatory
- GRB 120802A: Swift detection of a burst