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 140930B: MASTER early possible OT detection
- GRB 140930B: Gemini South Spectroscopy
- GRB 140930B: GROND observations
- GRB 140930B Swift-BAT refined analysis
- GRB 140930B: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 140930B
- GRB 140930B: Keck NIR imaging
- GRB 140930B: Swift-XRT refined Analysis
- GRB 140930B: Enhanced Swift-XRT position
- GRB 140930B: MMT confirmation of the optical afterglow
- GRB 140930B: ISON-Kislovodsk observations
- GRB 140930B: WHT detection of candidate afterglow
- GRB 140930B: 1.23m CAHA optical observations
- GRB 140930B: Prompt enhanced Swift-XRT position
- GRB 140930B: MASTER early optical observations
- GRB 140930B: Swift detection of a short burst