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"18 results found.
- GRB 121128A: optical observations in Mondy observatory
- GRB 121128A: optical upper limit in Maidanak observatory
- GRB 121128A: optical observations
- GRB 121128A: Optical Observations
- GRB 121128A: optical observation in Mondy observatory
- GRB 121128A: MITSuME Akeno Optical upper limits
- GRB 121128A: optical observation in Mondy observatory
- GRB 121128A: WSRT radio observation
- GRB 121128A: Swift/UVOT Detection
- GRB 121128A: Swift-XRT refined Analysis
- GRB 121128A: Enhanced Swift-XRT position
- GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
- GRB 121128A: Fermi GBM observation
- GRB 121128A, Swift-BAT refined analysis
- Konus-Wind observation of GRB 121128A
- GRB 121128A - Gemini North redshift
- GRB 121128A: FTN optical afterglow confirmation
- GRB 121128A: Swift detection of a burst with an optical counterpart