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 070208: MARGE Optical Observations
- GRB 070208: Swift XRT refined analysis
- GRB 070208: RAPTOR detection of early afterglow onset
- GRB070208: Absorption and emission redshift from Gemini
- GRB 070208: MDM Optical Decay
- GRB 070208, Swift-BAT refined analysis
- GRB 070208: Early IR detection and afterglow astrometry
- GRB 070208: Afterglow confirmation from P60
- GRB 070208: ROTSE-III Optical Limits
- GRB 070208: MDM Observations
- GRB 070208: Swift detection of a burst