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"16 results found.
- GRB 200131A: Tautenburg observations
- GRB 200131A: Further RATIR Optical Observations
- Konus-Wind observation of GRB 200131A
- GRB 200131A: CALET Gamma-Ray Burst Monitor detection
- GRB 200131A: Swift-BAT refined analysis
- GRB 200131A: ISON-Castelgrande optical observations
- GRB 200131A: CDK700 optical observations
- GRB 200131A: Swift/UVOT Detection
- GRB 200131A: Swift-XRT refined Analysis
- GRB 200131A: VIRT optical transient detection
- GRB 200131A: LCO Optical Detection
- GRB 200131A: KAIT Optical Upper Limit
- GRB 200131A: RATIR Optical Observations
- GRB 200131A: Enhanced Swift-XRT position
- GRB 200131A: MASTER optical transient detection
- GRB 200131A: Swift detection of a burst with an optical counterpart