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"16 results found.
- GRB060418: Swift XRT Team Further Refined Analysis
- GRB 060418: prediction of t_break
- Konus-Wind observation of GRB 060418
- Erratum of GCN 4983 for GRB 060418 IR follow-up
- GRB 060418 : IR afterglow observations
- GRB 060418 : Lulin Optical follow-up
- GRB 060418: JHKs PAIRITEL Observations of Afterglow
- GRB 060418: Radio Observations
- GRB 060418: FRAM early afterglow observation
- GRB 060418: Refined Analysis of the Swift-BAT burst
- GRB060418: Swift XRT Team Refined Analysis
- GRB 060418, SMARTS continuing afterglow observations
- GRB 060418: PROMPT Detections
- GRB 060418, SMARTS optical/IR afterglow observations
- GRB 060418: REM candidate afterglow
- GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow