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"17 results found.
- GRB 070724: Closer association with DSS source
- GRB 051221: Redshift from Gemini
- GRB 051221: Continued fading of optical afterglow
- GRB 051221B: BOOTES optical observations.
- GRB 051221: Discovery of fading optical afterglow
- GRB 051221: Swift XRT refined analysis
- GRB 051221: Swift/UVOT upper limits
- GRB 051221: Possible nearby cluster
- GRB 051221: No variability in Gemini data
- GRB 051221: Correction to GCN #4368
- GRB 051221: Gemini observations
- GRB 051221: Improved astrometry of the IR counterpart
- GRB051221: K-band source
- GRB 051221: XRT position
- GRB 051221: Refined analysis of the Swift-BAT short hard burst
- GRB 051221: IR Observations at GRB+1hr
- GRB 051221: Swift detection of a bright short burst