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"8 results found.
- GRB 120202A, the review of the sky area in plate archives
- GRB 120202A: MASTER early optical observations
- GRB 120202A: D50 optical limits
- GRB 120202A: GROND observations
- GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
- GRB 120202A: Swift/XRT and UVOT observations
- GRB 120202A: TAROT Calern observatory optical observations
- GRB 120202A: A long GRB detected by INTEGRAL