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"16 results found.
- GRB 060926: MASTER: discovery of the optical flare
- VLA observations of GRB 060926
- GRB 060926: Swift-UVOT UVW1 Detection Retraction
- GRB060926: improved redshift
- GRB 060926: MASTER: first minutes decay
- GRB 060926: Swift-UVOT Detections
- GRB 060926: OPTIMA-Burst -- further observations
- GRB 060926: Swift XRT refined analysis
- GRB 060926, Swift-BAT refined analysis
- GRB 060926: MASTER OT alert observation
- GRB 060926: RTT150, UVOT afterglow candidate confirmation
- GRB 060926: BOOTES-IR observations
- GRB 060926: Watcher observations
- GRB060926 OPTIMA-Burst optical observation
- GRB 060926: MASTER optical observation
- GRB 060926: Swift detection of a burst