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"11 results found.
- GRB 140518A: T100 observations
- GRB 140518A: Continued RATIR Optical and NIR Observations
- GRB 140518A, Swift-BAT refined analysis
- GRB 140518A: Swift-XRT refined Analysis
- GRB 140518A: Skynet GORT Detections of the Optical Afterglow
- GRB 140518A: Swift/UVOT Upper Limits
- GRB 140518A: RATIR Optical and NIR Observations
- GRB 140518A: Gemini-N redshift
- GRB 140518A: P60 i-/z-band detections
- GRB 140518A: KAIT optical candidate
- GRB 140518A: Swift detection of a burst