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"18 results found.
- GRB 130603B: 5.8 GHz VLA detection
- GRB 120804A: Late-time Chandra observation
- GRB 120804A: Possible temporal break in the X-ray light-curve
- GRB120804A: Chandra observations and afterglow detection
- GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
- GRB 120804A: ATCA 34GHz upper limit
- GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
- GRB 120804A: ATCA 34GHz upper limit
- GRB 120804A: EVLA Detection
- GRB 120804A: Gemini-North observations
- GRB 120804A: Swift-BAT Spectral lag analysis
- GRB 120804A: MITSuME Okayama Optical upper limits
- GRB 120804A: Swift/UVOT Upper Limits
- GRB 120804A: Swift-BAT refined analysis
- GRB 120804A: Swift-XRT refined Analysis
- GRB 120804A: GROND upper limits
- GRB 120804A: Enhanced Swift-XRT position
- GRB 120804A: Swift detection of a short burst