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"19219 results found.
- Swift-BAT Time History of GRB041219
- GRB041223: Swift XRT Detection of X-ray Afterglow Emission
- GRB041223: ROTSE-III Optical Observations
- GRB041223: Swift-BAT detection of a bright long burst
- GRB041220: Swift-BAT burst
- GRB 041219 Optical Observations
- GRB041219c: Third Burst in One Day from Swift-BAT
- GRB041219b: A Swift-BAT burst
- Swift-BAT detection of the bright long burst GRB041219
- GRB041217: optical limit 30 min after GRB
- GRB041217: Optical Observations
- GRB041217: NIR and optical observations with REM
- GRB041217: P60 Optical Observations
- GRB041217: Infrared Observations
- GRB041217: The First GRB Located On-Board Swift
- GRB040916: Optical observations
- GRB040422: optical and NIR observations at the VLT
- GRB040223, improved XMM position
- SN 2003jd (SN/GRB?) - possible association with GRB 030929