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"10 results found.
- GRB 110213B: Swift/UVOT observations
- GRB110213B: X-ray afterglow confirmation
- GRB 110213B: GROND observations of the optical/NIR afterglow
- GRB 110213B: Gemini South Redshift
- GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
- GRB 110213B: P60 Optical Afterglow Candidate
- GRB 110213B: Swift XRT observation
- Konus-Wind observation of GRB 110213B
- GRB 110213B: MAXI/GSC refined analysis
- GRB 110213B: MAXI/GSC detection of a probable GRB