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"15 results found.
- GRB050306: optical afterglow not confirmed
- GRB 050306: ROTSE-III early limits
- GRB 050306: Radio Observations
- GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
- GRB 050306: optical afterglow
- GRB 050306: Confirmation of X-ray afterglow
- GRB 050306: further TAROT optical data
- GRB 050306: CORRECTION to date of observation
- GRB 050306: R-band observations
- GRB 050306: No Swift UVOT Optical Counterpart Detected
- GRB 050306: REM optical-infrared observations
- GRB 050306: Possible X-ray Afterglow Position from the Swift
- GRB 050306: TAROT optical observations
- GRB 050306,optical observation
- GRB 050306: Swift-BAT detection of a long burst