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 050607, radio observations
- GRB 050607: MDM Observation
- GRB 050607 optical decay
- GRB 050607: RTT150 optical observations
- GRB 050607 : Lulin R-band observation
- GRB 050607: PROMPT VRcIc Observations
- GRB 050607: RAPTOR-S Early Optical Limits
- GRB 050607: Optical decay and spectral slope
- GRB 050607: MDM Observations
- GRB050607,optical observation
- GRB 050607 - XRT refined data analysis
- Optical Afterglow of GRB 050607
- GRB050607: Swift Detection of a long GRB