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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"17 results found.
- GRB 100219A: MASTER-Net optical alert observations
- GRB 100219A: optical upper limit
- GRB 100219A: optical observations
- GRB 100219A: GAO 150cm telescope Optical Observation
- GRB 100219A: X-shooter refined analysis
- GRB 100219A: XRT refined analysis
- GRB 100219A - Gemini South Spectroscopy
- GRB 100219A: VLT/X-shooter redshift
- GRB100219A Akeno and Okayama MITSuME Optical Observation
- GRB 100219A: GROND observations
- GRB 100219A: NOT OA observations
- GRB 100219A: Enhanced Swift-XRT position
- GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
- GRB 100219A: Swift-BAT refined analysis
- GRB 100219A: Pre-explosion imaging and host candidate
- GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
- GRB 100219A: Swift detection of a burst